Ok so had unprotected sex about 4 days ago and started my periods yesterday and they are normal
Could I still be pregnant :/

It's unlikely that you're pregnant if you got your period. Also, 4 days after sex would be way too early to tell. You wouldn't even be officially "pregnant" at this stage.

If you're really worried about it, wait until your next period, and if you miss it, try a home pregnancy test. I definitely wouldn't take a test now, even without a period it would be way too early to test.