Success after IF

What is the average follicle size at LH surge/ovulation?

Yesterday i went in for an u/s and my lead follicle was around 18mm.  I got a negative OPK last night and a negative this morning (Im testing twice a day to make sure I catch my LH surge).  Im wondering what the follicle size normally is at the LH surge or right before ovulation?  I would assume i will get a pos OPK tonight or tomorrow as I believe the follicle is growing about 2mm a day since it was 14mm on Monday and then the 18mm on Wed.  I also can sense the O is coming due to CM increase (sorry if TMI)

I am doing a natural FET by the way and am nervous about not catching the surge or something going wrong.  Do OPK's gradually get darker before you got the actual positive? 

Severe MFI resulting in IVF/ICSI #1 in Nov 2007. BFP!!
Our beautiful son was born July 2008.
2010: 2 IVF's,1 FET = 2 BFN's, 1 c/p :(
Feb 2011-Unmedicated FET= BFP!! DS #2 born Oct 2011!!.



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Re: What is the average follicle size at LH surge/ovulation?

  • I don't know much about FET's, but I triggered last week with one follicle at 20mm, so I think you should get a positive OPK VERY soon! Are you testing in the AM and PM?


    Dx: PCOS, Anovulation, RPL
    Born via emergency c/s February 9, 2008 - 9lbs, 3 oz!!!!

    Lilypie Fourth Birthday tickers

    TTC# 2 since February 2010 - BFP #1 Sept 2010-(5mg Femara, 1500mg Met, Ovridel) Missed M/C at 10w2d, discovered at 13w2d, D&C at 14w

    BFP # 2 - February 2011-(1500mg Met, HCG Injection) Missed M/C at 10w1d, discovered at 10w3d, D&C at 11w...RPL testing came back all normal.

    Trying again. June 2011 - Clomid/1500 mg Met / Baby Aspirin - BFFN!

    July 2011 Femara/1500mg Met/ Baby Aspirin - c/p

    August 2011 - Femara/1500mg Met/ Baby Aspirin - c/p

    September 2011 - Puregon/ 1500mg Met/ Baby Aspirin - BFFN!!!!

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  • Yes, both AM and PM.  Ive never done an unmedicated FET before so this is all new to me!  Thx
    Severe MFI resulting in IVF/ICSI #1 in Nov 2007. BFP!!
    Our beautiful son was born July 2008.
    2010: 2 IVF's,1 FET = 2 BFN's, 1 c/p :(
    Feb 2011-Unmedicated FET= BFP!! DS #2 born Oct 2011!!.



    Lilypie Fourth Birthday tickers

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  • Before I even opened your post I was thinking 18mm so you should be right on track!  GL to you girly! 
  • i used digital OPKs b/c i was so afraid about missing the surge- regular ones are so difficult to read.

    i forget what my follie size was when i got pg with Griffin... but with the twins, the morning after my positive OPK my follies were 21mm and 25mm.... 18mm being what my RE considers mature.

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