Should I be worried?

Hey I need help...? So like 2 weekends ago I had sex... and it was unprotected. So I’m like really scared at the moment. But when we had sex... I was on my period and I just started it on Friday and I had sex on Sunday night going on to Monday. So after the sex I went home and peed and took a long hot shower and cleaned down there. My period went on till Wednesday that week but I’ve heard there’s like 1% chance out of 1000% to get pregnant cause maybe the blood clots you know maybe kinda pushed out and went down with it and I don’t remember if he pulled out or not and I asked him if he cummed in me and he said no ... but do you think I am or not? I need help😭