Trusting Birth Control

While I use condoms with my boyfriend, just a couple times I've let him give me a few strokes without one. I'm on birth control, and I use it correctly but these last 2 weeks I've taken it later then usual. I dont fully trust the birth control yet, should I? And is it just my head being paranoid? (Pregnancy is not an option and I know to prevent it to use condoms, just wanted some trust advice)