VBAC

LMP dates?

Would you ever consider fudging the date of your LMP to increase your chance of VBAC? 

 I recently just found out I am pregnant with #2 .  Because I charted, I know I O'ed on CD19.  Considering the late ovulation would allow me a few extra days to attempt a VBAC.  The doc already told me at my annual that she would only let me go to 41 weeks.

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Re: LMP dates?

  • No. If you get an ultrasound, they'll be able to date your pregnancy to the day.
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  • I would. Early dating u/s aren't mandatory.
    DS1 - Feb 2008

    DS2 - Oct 2010 (my VBAC baby!)

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  • I did but only by 4 days.  I didn't want to move it too much but I figured a few days couldn't hurt.
    DS- 11/08,  DD1 - 05/10,  DD2 - 11/11

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  • Yes, and I would also refuse dating u/s.
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  • I O'd at CD17 too for both of my pregnancies. I told the OB's office that my LMP started 3 days later than it did because I knew that they would base everything on that. My ultrasounds have measured perfectly to what I know to be my O date and the LMP they think I had. It just makes things easier because they never listen when you tell them you know your ovulation date.
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  • I did with the first practice by 3 or 5 days (can't remember) b/c I knew they would only let me go to 41w and I had DS at 40w6d.  I did end up with an early u/s since the midwife was able to find the hb via doppler really early (like 8-9w).  Even though it measured "ahead" we kept the EDD that I gave her b/c it was within the range.  When I switched practices at 24w I told them my real info b/c I knew they were super supportive and let me go to 42w if needed.
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  • imageannabelle.27:
    No. If you get an ultrasound, they'll be able to date your pregnancy to the day.

    This is not really true.  They have a range.  As long as you're within a week of their range, they won't change your EDD.

    OP - I plan to give a false date by about 4-6 days.  I know I ovulate on or around day 18, so it's not a big stretch.  I want to give myself every chance to VBAC, since I had a c/s at 42wks1dy with DD.

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  • If you give them a LMP date that is more than two weeks off from the ultrasound they will use the date from the ultrasound.


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  • My plan was to give them a date of 5 days off since I O'ed on CD19 instead of CD14 like "normal"  With DS, I always measured ahead by about a week or so and they never changed my due date.  I just figured if I could get an extra week out of the doc, I would have a better chance of VBAC
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  • If you know your O date, yes I think that is fine.

    But hopefully you will have a practitioner that you don't have to lie to.  My LMP was a little off from my O date (I O'd on CD 16) and I told my doctor that according to my chart, my EDD should be 2 days later.  And it was never an issue. 

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    Big sister {September 2008} Sweet boy {April 2011} Fuzzy Bundle {ETA July 2014}

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  • imagecchill01:

    imageannabelle.27:
    No. If you get an ultrasound, they'll be able to date your pregnancy to the day.

    This is not really true.  They have a range.  As long as you're within a week of their range, they won't change your EDD.

    OP - I plan to give a false date by about 4-6 days.  I know I ovulate on or around day 18, so it's not a big stretch.  I want to give myself every chance to VBAC, since I had a c/s at 42wks1dy with DD.

    with both my pregnancies they changed my due date by 2 or 3 days to line up with the ultrasound.

    For those saying to skip the dating ultrasound- the ultrasound will confirm HER dates, as baby starts developing from conception, not LMP. I'm thinking it won't be necessary to lie about LMP. For both my pregnancies, they "assigned" me a new LMP date to line up more accurately with what the ultrasound showed.

    OP: just be honest. Tell your doc you chart and know the date of conception.

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  • I would. I told my doc the actual date of my LMP, but the baby was measuring smaller than that. They said it's just a few days so the due date won't change, but I insisted they change my due date so I wouldn't run into issues of going past 40 weeks. 

    Especially if you know your ovulation dates, do what is going to be best/easiest for you.

     

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  • imageannabelle.27:

    with both my pregnancies they changed my due date by 2 or 3 days to line up with the ultrasound.

    For those saying to skip the dating ultrasound- the ultrasound will confirm HER dates, as baby starts developing from conception, not LMP. I'm thinking it won't be necessary to lie about LMP. For both my pregnancies, they "assigned" me a new LMP date to line up more accurately with what the ultrasound showed.

    OP: just be honest. Tell your doc you chart and know the date of conception.

    But if an u/s is within 5 days of an LMP-based due date, it doesn't need to be changed. With later u/s, I think if it's within 10-14 days of EDD, it's also not changed. 

    Early dating u/s might be a common thing, but they aren't totally necessary, especially if the woman knows when she got pregnant. And lots of providers don't understand/care if a woman charts, they still go off of LMP.

    DS1 - Feb 2008

    DS2 - Oct 2010 (my VBAC baby!)

  • imageannabelle.27:
    imagecchill01:

    imageannabelle.27:
    No. If you get an ultrasound, they'll be able to date your pregnancy to the day.

    This is not really true.  They have a range.  As long as you're within a week of their range, they won't change your EDD.

    OP - I plan to give a false date by about 4-6 days.  I know I ovulate on or around day 18, so it's not a big stretch.  I want to give myself every chance to VBAC, since I had a c/s at 42wks1dy with DD.

    with both my pregnancies they changed my due date by 2 or 3 days to line up with the ultrasound.

    For those saying to skip the dating ultrasound- the ultrasound will confirm HER dates, as baby starts developing from conception, not LMP. I'm thinking it won't be necessary to lie about LMP. For both my pregnancies, they "assigned" me a new LMP date to line up more accurately with what the ultrasound showed.

    OP: just be honest. Tell your doc you chart and know the date of conception.

    2 or 3 days is within the margin of error for a dating u/s so changing a due date based on that is a little silly IMO.  Nothing can tell you how far along you are to the exact day.  Even ovulation charting is +/- 1 day. 

    ETA Not including IF treatments here 

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    Big sister {September 2008} Sweet boy {April 2011} Fuzzy Bundle {ETA July 2014}

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  • Overall, I am not a fan of lying about dates, but if your doctor thinks everyone Os on CD14, I'd have no problem adjusting to match with the actual O date.
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