Given that the doctor gave you the due date from looking at a little cardboard wheel, you really can't guarantee that the interesting events of February 23-27 produced the baby. If you are super-regular, and every period comes every 28 days without fail, then it would suggest you ovulated on the 27th. But if your cycles are irregular, or longer or shorter than average (and by cycle, I mean the time between the first day of one period and the first day of the next period, a time period that for some ladies is 28 days) you could have gotten pregnant some other time than the 27th. The doctor, at this late date, will have no way to medically judge when you ovulated. The reason I asked if you got your information from an ultrasound and not just a little cardboard wheel is that ultrasound info is more reliable than simply counting forward from the first day of your last period. Are your cycles super regular, such that you could set your watch by them coming on day 28 without fail?
There really is no way - even an ultrasound performed at 6 weeks, to tell which of 3 sexual encounters in 3 days led to pregnancy. It's most likely the guy who didn't use a condom, but that's not for sure, and there is no "dating" test that will discern between sex within a 3 day span.
Have you had an ultrasound yet? If so, did they give you an estimated due date from the measurements of the baby?
Hi, why do you think you conceived on February 27?