am I pregnant??

I had unprotected sex on the 20th of may. I got my period on the 21st and it lasted until the 26th. He did not cum inside me but I know there is still a possibility of getting pregnant. I am starting to get a little worried that I haven't gotten my period yet. I'm being paranoid and checking on a much of different apps and some say my periods 10 days late, some say it's coming tomorrow? I have felt a little nauseous some days but that's about it. But also I have been very stressed lately and I know stress can delay your period. Is it even possible for me to be pregnant if I got my period after having sex??