My ex girlfriend is 30weeks 3 days today her due date is june 112,2017,i was wondering if you could help me with a date of conception, plz.

28 weeks 3 days ago: The standard way of counting pregnancy weeks is from the beginning of the last menstrual period, and presumes a 28-day menstrual cycle. That means the pregnancy weeks officially start 2 weeks before ovulation and conception. Thus a person who is 30 weeks pregnant is presumed to have conceived 28 weeks ago. In natural pregnancies, all dates are estimates, plus or minus one week.