Am I going crazy?

Had a wonky period (I think because I messed with my birth control a bit but now I'm not sure) and decided to go on a research to see if I'm pregnancy craze. I feel like it's made me so paranoid!

I've been sexually active for almost three years now, while also on birth control. I've taken FIVE pregnancy tests in the past 3 weeks (at 2 weeks post ovulation, and at 5 weeks post ovulation). They were all negative. I also had a pelvic ultrasound that showed nothing.

So why am I still so paranoid? I feel like I'm annoying my boyfriend (he doesn't show it but I imagine a STILL overly anxious girlfriend after five negative tests gets annoying).

Does anyone have any advice?