I want to know how thi s pregnancy and ovulation thing works?

First let me say I had an ultrasound done the 6th february and they found a 8.4*8.0 fibroid in the posterior wall of my uterus but my kidneys and ovaries are normal but my uterus is measuring at 11 and something i cant remember right now. My last period was the 6th of march and ended the 11th i had the 17th of march and i have a 28 day cycle but i believe i started to have the strecthy eggwhite discharge because i place it between my fingers and it had a strecth so when me and my partner had i was on top so when he *** he didnt pull out but it didnt feel it run out either. So like yesterday i had alot of pain in ovaries.What i want ti know is if I has on monday would I have had an egg there already? How does it actually works?When did the egg leave my ovaries? And would the sperm still be alive when it comes although I had since monday?My legs are hurting like my period is to come so I said it probably had`nt meet the egg or i had to early