When is week 1?

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dolly01 Posts: 8
Hi there, the first day of my last period was October 28th but i would have conceived on November 7th (sex in other words!!!!!) sorry for being graphic. When is my first week? I think the doctor counts it as oct 28th = 14 days and thats day 1 of week 1? any advice
borntobeamammy Posts: 324
pregnancy isnt really defined by week one,by the time you find out your pregnant you are usually week 4 or 5,week 4 for being the week you missed your period,they date form the last menstral period,so i guess week one is the week of your last period,but no one is ever 1 week pregnant as thats impossible to know if your pregnant til week 4/5,hth why do you want to know anyway??
Daff Posts: 11644
it's taken from your last AF, so you're 5 weeks today! congrats. Come join us over on the August 2011 thread. Your due date would be 4th August!
funkyfish Posts: 7626
week one begins the firstr day of your LMP
candypants Posts: 8575
Hopefully you understand it, it can be a bit daunting at times. But you do normally start of as 4 or 5 weeks pg as OP said. I never really get when peoples tickers say 3 weeks pg?? :-8