why do I think I'm pregnant??

KeKe
I NEVER get my period because of my birth control. I had unprotected sex with my bf and 5 weeks later I got my period. I bled heavy for a full 6 days. 2 days after my period ended I was concerned I messed up my birth control so to be extra safe I took a plan B. A week after taking the plan B I bled for another 5 full days. I'm on birth control, my bf pulled out everytime, I got my period, took plan B and got another period but I still worry that I'm pregnant! I'm very bloated but I have no other symptoms that suggest I'm pregnant. Why am I so worried that I'm pregnant??