Help pls

I had been on a new birth control for three full weeks and I got a migraine on the third Friday of taking the pill. The migraine persisted until Saturday so I didn't take my Saturday pill. This prescription ha you take pills though the fourth Wednesday and then you get your period and start taking them again that Sunday. So I missed the pills from Saturday to Wednesday, got my period like Monday and then started the pills again on Monday. I had sex Monday and didn't use a condom but my boyfriend pulled out... same thing Tuesday and Wednesday then I got worried so I took a plan b on Thursday... it has now been two weeks and I'm still taking my pills but should I be worried that I could be pregnant? (I suffer from anxiety disorder so I dont know if I'm just fixating because of my anxiety if that sounds suspicious)