Hi. I'm 17 Years Old And I ALWAYS Have Protected

Hi. I'm 17 years old and I ALWAYS have protected sex. Almost 3 months ago, I had sex with my boyfriend the day after my period. We used a condom and I had just switched the birth control pill I was on so that was the first day of taking it. He finished on my butt and back and I was scared so I took plan b. I took plan b again a week after even though we used a condom. I was on the Progestin only pill and I just recently switched back to the estrogen pill as well. I haven't had a period for 2 months and I'm scared. I have really bad anxiety so I was stressed about it and that can delay a period plus my birth control and plan but I've taken over 40 prego tests (all negative) just wondering the chances of being pregnant because I've read stories where this has happened to women. I don't really have any pregnant symptoms. I'm just scared and need some reassurance