Unprotected period sex??

Okay so last night me and my boyfriend decided to get drunk together and just hangout the two of us.

Things heated up by the end of our game off strip beer pong 😂 and we were ready to get it on.

Note** I started my period literally the same day just in the morning so it was the heaviest part of my cycle

He didn't care and I didn't care (which was unusual, we alwaysjoke about how it would be weird to fuck while I was on my period loll)

So we end up fucking and we did without a condom on for the first time. Let me tell ya, it was a fucking experience holy shit I didn't know sex could feel that good 😍😍

But what I need to know is if I'm at a higher or lower chance of pregnancy since it's the first day of my period based on my cycle. Keep in mind I'm on birth control and he pulled out but I know there's always precum lingering. So I need you ladies to help me out!!! Do I need to be worried or go get the day after pill?? SOS THANKS 🙏🏼