18 days Late, Still negatives.

I was supposed to get my period on 4/20 i ovulated the 7th, we had unprotected sex all that week but he would pull out, which i know isn’t the best method. We have sex pretty much all the time but he never comes in me, I’m not really stressed to the point where my period is late, I’ve probably been more stressed before. I’ve taken pregnancy test but they come out negative. I’m about to take one today again after 4 days. Has this happened to anyone else before and ended up not pregnant OR pregnant?