Flow Back after Sex

i hav recently been tryin 4 a baby so hav not had many experiences of flowback.infact i neva heard of it until today cause i researched what had been happenin.anyway, i think it depends on what you do after sex,the first time i lay down for a while then later started walking around and it happened,so that took approx half an hour but the last time i got up straight away n got flowback about 10minz after.there too many variables to give a definitive answer.i know that isnt the answer you wanted to hear.x :-)