last period was 5/16/10 started clomid on 5/19/10 had sex on 527/10 & 5/28/10 laid elavated with legs straight up for hours......started having menstral like cramps on 5/30/10 and lasted till 5/31/10 assummed i was ovulating then?? started to have sex again late night like 1am on 5/31/10 but didnt get to only got to put it in for 10 secs or less and had to stop.....which day if pregnant was it most likely to have happened? should have got period on 6/13/10.......can you get pregnant by precum? if i started ovulating say at noon 5/30/10 how long would it last? 24 hours from the time i started feeling cramps?
Regarding your queries, yes it is possible to get pregnant by the sperms present in the pre-cum. But keeping upright posture after sex does not increase chances of pregnancy. The time of possible fertilization of egg after ovulation is about 24 hrs.