My period was from May 3rd-8th. For the last couple of months prior to May it was jumping around between 25 & 35 days. After May 8th, I had sex with my bf several times, but on May 16th I had unprotected sex with my ex-bf. The following day so about within 24 hours I took the 72-hr pill. Following that I had sex with my current bf or w.e on May 20th and he told me that a tiny amount of sperm went into me before he pulled out and I did nothing about that.
I found in June that I was pregnant. I had an ultrasound on July 26th which said that I was 12 wks 0days, but thats the gestational age becuase that would put me at May 3rd. I heard that you subtract two weeks for conception date, however my menstrual cycle has not been on a regular 28 day cycle so i ovulate at different times. With that in mind and the fact that i took the pill, when did i most likely become pregnant? the 16th or the 20th?