when did i conceive

[firstmummy]

i am due 26th april 2011 so when did i conceive??

my first ultrasound on the 15th september
dating me 7 and half weeks and then one on the 27th september dating me 9 and half week

had sex with my partner 3rd july, 24thjuly &7th august
what occasion is more likely made me pregnant??

I'm no expert, but I would say it all depends on when your last period was before conceiving because how many weeks pregnant you are is counted from that - you will have ovulated a couple of weeks after the first day of your last period, and if you find out 2 weeks later that you're pregnant its actually classed as 4 weeks.

So based on the dates you give I would guess at 7th August. Could be completely wrong though... like I said I'm no expert

does it really matter? your dating scan is accurate .

especially the early one

the egg can survive in your body for 24 - 48 hours, sperm for 5- 7 days so it might not even be you conceived the day you had sex, IFYSWIM

also, your due date is estimated, it could be 3 weeks before or 2 weeks after ands till be within the normal range of how long pregnancy lasts