Could I still be pregnant?

I had unprotected sex on April 13, I was supposed to get my period on May 3rd but I got it on May 1st. Is there a chance I can still be pregnant? My period was able to fill up tampons and I noticed I had more clots than usual, I’ve been reading that it’s common to think this is just a period but there is still a chance of pregnancy. I just want to know if their are any girls who have actually been pregnant like in a similar situation as mine. I’ve been feeling slightly bloated and sometimes nauseas but I don’t know if this is from my period or other symptoms.