Would a pregnancy test 30 days after previous menstral cycle produce correct results?

Usually: A pregnancy test will turn positive 2 weeks after conception which occurs shortly after ovulation. Most women have a 28 day cycle and will ovulate on day 14 so a test done after 30 days should turn positive. However, sometimes women will ovulate later than the 16th day in which case a rest done on day 30 would be to early to turn positive.