confused of which week I am in

JdLB82 · February 2013

based on the calculation on here I am 8 weeks 0 days pregnant, but based on the pregnancy calendar my doctor gave me it says I am one week ahead, so 9 weeks 0 days. Both of these calendars are based on the first day of my last period which was December 24, 2012. Any idea why they are one week apart?

BookWorm11 · February 2013

Those calenders that calculate due date do so by going 40 weeks past the first day of LMP, assuming that everyone ovulates on day 14 of a 28 day cycle. What did you use to calculate your due date?

smilormarie · February 2013

You should be 8 weeks. I think your doctor might be wrong. You wouldn't count Dec 24th as being 1 week pregnant. You would count Dec 31st as 1 week. Maybe it's because you are entering your 9th week? I'd ask him to clarify.

sekenn0 · February 2013

I was just searching for the same info. This site says I'm 6 weeks and another site says 7 weeks. My due date is supposedly 10/13/13 based on the online calculator. My last period started 1/6/13. But I cannot figure out why the weeks are different for different sites. I think this site doesn't start counting until you've finished the first full week whereas the others start you at week 1 from the date you start your period. That doesn't really make sense though.

magdalina.h · February 2013

When did you ovulate? Or how long are your cycles?

sugarellie · February 2013

I think the difference may be in the "week" you are in. For instance, I am 10 weeks 3 days but technically im in my 11th week of pregnancy. My 10th week of pregnancy ended on Friday. I know on some of my pregnancy apps there is differing information and I think it has to do with the fact that some use 10 week info for 10 weeks and all the days up to 11 weeks and some use 11 week info for anything past exactly 10 weeks..

sekenn0 · February 2013

That makes sense. So which weekly update do I ready? The one that seems accurate or the one that puts me further along?

sugarellie · February 2013

sekenn0:
That makes sense. So which weekly update do I ready? The one that seems accurate or the one that puts me further along?

I would personally use the one that seems more accurate. If you have a dating u/s that is really the only way to know exactly how far along you are, because chances are if you have not had one you are most likely not exactly 8 weeks or 9 weeks you are probably somewhere in between.. going off the LMP is usually your best guess. I was even charting when I got my BFP and thought I knew exactly how far along I was, welp low and behold at the u/s I was further along than I thought so there is just no way of knowing until that u/s

ETA: I was going off the OP's dates

sekenn0 · February 2013

I just started charting in January. So I ovulated on 1/20 and also conceived that day. That I know for sure. I have my first ultrasound on 3/12. They were calling it my 10 week ultrasound. It's really at 9 weeks though. So I just thought they scheduled it around 10 weeks. I guess I'll know specifics then. Either way, my due date seems to be the same. It's not a big deal but at this point if I'm one week further than I think, it just makes me feel good in between the morning sickness:)

leahaustin · February 2013

The LMP calculators are based on a 40 week scale so there is no way one could be saying 8 and the other 9. I would ask your doctor about how his calculator works.

JdLB82 · February 2013

thanks for all your responses.

the chart the doctor gave me has a wheel on it, that you match up to the correct date for you. There is a big arrow that says "first day of last period" so I lined that up to December 24, and according to that on Feb 20 I am 9weeks2days, but this website says I am 8weeks2days. I have my first ultrasound on Feb 26th, so I guess I will know for sure then.

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