should i take plan b?

Li

While I was having sex the condom slipped off halfway, not fully. We changed it before that happened and there is a low chance that there was precum and there was totally not a drop of cum. The morning after pill might have bad side effects on me so I’d rather not take it, but I can get extremely paranoid about pregnancy. I’m on the 20th day of my cycle so the chance of pregnancy overall is low. Please help