Could I get pregnant?

It has been years since me and my partner had sex, I had sex on the 2nd and 3rd day of my fertility window which was on a Tuesday and Wednesday and my highest fertility days were predicted on Thursday, Friday with my ovulation day on Saturday. 2nd day he pulled out. 3rd day was twice, 1st time with a condom and 2nd without and he pulled out again. 
I'm worried about getting pregnant because I don't want any children whatsoever but I realize that I made a mistake being caught up in the moment since it's been so long since I've had sex. Can you get pregnant by pre cum and how soon can I find out if I am pregnant or do I just wait it out? My period is supposed to start on the 28th and waiting is just making it worse for me.