Late/missed period

The last time I had (unprotected) sex was March 17th, 3 days before ovulation. I got my period when I was supposed to in April but it lasted 4 days instead of the usual 5. Now it’s May and I’m 13 days late, is it possible that I’m pregnant? Should I be worried?

I’ve also been stressed because of school, quarantine, and my family. Also have stopped smoking, been staying indoors 24/7, and have been rather sedentary as well. My conservative mom wants me to get a pregnancy test and thinks I’m lying about my period in April. Is there any way I can induce my period?