Ob-Gyn questions? Ask a gynecologist online.
time of conception depends on the regular lenght of your cycle. Ovulation usually takes place 14 days before the beginning of period. So on a 28-days-cycle it would be day 14, day 13 would require a 27-, day 16 a 30-day-cycle.
Dr. N. Scheufele
Generally there´s a range of about 7 days (plus/minus) concerning the definition of ovulation date, so with intercourses of this distance a reliable decision is not possible. However the drop of precum only can contain sperm if the bladder wasn´t emptied after last orgasm, so 10th of may is much more likely.
Hello,if there are still open questions, I will be glad to answer them. Otherwise please don´t forget to honour my work with a kindly rating (3-5 stars).Thanks a lot, all the best for you,Dr. N. Scheufele