If i had sex april 15 and on june 18, 2013 i was 7 weeks 4 days when did i concieve? was it from the april 15 date?

Probably Not: Most women have close to a 28 day cycle. Pregnancies are calculated from the last menstrual period which occurs generally two weeks before ovulation. Sex within 1-5 or so days before ovulation can result in a pregnancy. If you had an ultrasound on june 18 stating you were 7 weeks and 4 days (with a +/- 3 day error range), you likely got pregnant around the 10th of may give or take a few days.

Dates don't work: If you were 7w 4d on 6/18/13, then your likely or average conception date was around may 10th, thus the april 15th date doesn't work. Your last menstrual period from this pregnancy would have been around 4/26/13. Hope that helps!