Getting pregnant on period??

Okay I dont need anyone bashing me! I've googled this and cant seem to find an answer. Okay so I started my period, and on day 2 me and my husband had sex and he didnt pull out and I'm not on any birth control. So the day after we had sex my period just got super light and today it just stopped. Is this normal?

I also want to say that I have 3 children and we had to really try each time we wanted to get pregnant so I'm not a complete dumbass when it comes to that sort of thing. I mostly just found it so weird that my period would just stop