I made a mistake....

Kacey
I have been on birth control for almost a month, and I lost my virginity last Wednesday and we had unprotected sex and I'm pretty sure that he didn't cum inside me. However, we had sex this past Wednesday and yesterday, both unprotected, and he came inside of me both times.
Because since I'm on birth control, we decided not to use condoms (probably a very stupid idea)
If I wasn't on birth control, this would be my "fertile window" so I'm freaking out about possibly getting pregnant. I feel like an idiot.
I'm supposed to get my period next week. I hope it comes. I'm so so scared.
Any advice?