I used to hate these posts but here I am

I’m worried I’m pregnant. I had unprotected sex like 4 days ago. We had sex three times, twice at night then once in the morning. (I know that was irresponsible, should have used a condom etc.) but for the past 3 days I’ve lost my appetite and can barely eat. I won’t know for awhile because I don’t get my period for another 3 weeks. But on the day I had sex, <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> said I had a 7% chance of pregnancy. Is that accurate? Also how likely is it to get pregnant off of pre cum? One more important question. After a guy cums, could there still be a little bit of cum left inside him? Again please don’t lecture me