Stupid Question

If I’ve had 2 periods since having sex without a condom (I’m on birth control) I can’t be pregnant right. The first one right after was very heavy and I had a lot of cramps. The second one I didn’t hardly have cramps and I felt like I didn’t bleed as heavy. But during the second one (that I’m just coming off of) I was very sick, threw up twice, had tonsillitis, and a yeast infection I also was extremely stressed, stop smoking and had to make several emergency rooms trips for a family member.

Main Question:

I can’t be pregnant right?

Also: plz don’t attack me. I am trying to learn and understand. I’m a freshman in college and just lost my virginity a month ago this is all very new to me. Thank you again