Will I get pregnant if I had sex 4 days before my "fertility window" according to this app?

I had sex on the 5th day of my period, and he didn't ejaculate into me, and pulled out really early. (15-20 minutes later he ejaculated outside and that was by handjob) I'm just afraid abit of precum may have leaked out and get me pregnant. I know that precum may have sperms in it and can survive up to 5 days but I'm not sure whether I'll get pregnant. My CM is sticky, and starting to get a little watery already. He did ejaculate once the night before and urinated a few times before the sex (next afternoon).