Missed period

Kristy

So, I am 4 days late on my period. I took 2 pregnancy test one cheap one and one that said it can detect pregnancy 6 days before your missed period and both said no. Any tips on how to kick start a period or why I am missing it ? Do I listen to the 2 tests ? I have absolutely no symptoms of pregnancy and the last time I had unprotected sex was about 4-5 weeks ago and only for like a few seconds before I made him put a condom on. Just concerned! Help a girl out ! I’m not on birth control and I didn’t take plan b. I’ve been super stressed this past month so it could have something to do w that