Can someone explain?

[ChaCha]

I just typed in the date of my last period on the babycentre website to see what's supposed to be happening this week. It told me I was 9 weeks pregnant, yet my second scan tomorrow should read 7weeks and 3 days i think. How is this so?? I'm really confused!

I could be because of your cycle length. the calculator is based on 28 day cycle so if yours is much longer it will give you different results. this is the only reason i can think of !! HTH P>S> good luck 4 tomorrow. i've seen you on due in nov thread - i've got my 12 wk scan tomorrow!!

Did you type the first date of your last period?

try this one instead

Hi Twiglett, i'm sure i remember you for an old TTC thread
Thanks for the link, just typed in last date and got that today should be 8 weeks. I think maybe ovulation was CD9 then??? Oh well...should i go by scan date or that date?

Chacha, the babycentre one does the same thing to me, tells me I'm a week further on than I actually am - I just try to remember to lop a week off when I look at it!

When I log to babycentre it tells me I am on week 34, that's because by scan and dates I am 33 and 3 day. Thus in the 34th week.

So it should be telling you that you are on week 8. I don't understand why would it tell you week 9 if you have the right dates....

Fertilization doesn't always occur when ovulation occurs. And I guess a particular cycle could have a wacky time of ovulation... So there are some reasons for discrepance between your last menstrual period and the scan dates. BUt there shouldn't be any discrepancy between what week you are in by your LMP and what babycentre is telling you and your dates given it has the right lenght of your cycle....

Sory, this is probably not very helpful...!

Thanks. Lua i see what you mean (i think), when you say 33 days and 3 days meaning 34th week, does that mean that 7+3 or 4 is actually considered 8th week?
Sorry for all the trouble

yes you probably do Chacha but DD is almost a year old now so it was way back in the dim and distant past

as for adjusting how pregnant you are they'll only do that if the foetus is out by at least 7 days on growth - I knew based on when I ovulated that my dates were out by a week, but I measured only 5 days out so no adjustment and DD was born by c-section at week 38 (in my book) rather than week 39 (which is what hospital said)

don't get hung up on dates, it makes no difference really

Thanks Twiglett At the moment, it's like every day counts on the countdown to 12 weeks. I feel like every week is a step closer to not so much chance of anything going wrong - i know its naive but what to do.
My gosh..a year old.....in the very distant past! Nice to see you again anyhow x

Whoa, Twiglett! Thanks! That one's far more detailed.