Double contraceptive use, still worried

Please help! I’m 19, not trying to conceive. I only have sex about twice a month, and use a condom every time as well as take my bc correctly. I would describe my bc use as “perfect” being that I’ve never missed a dose, and the latest/earliest ive been away from my time was 30 min.

Yet, all I do is worry every single month about pregnancy. Obviously at my young age, pregnancy is not what I want at this point. Can someone help me with the statistics of protection I have? It’s getting to a point that I will not have sex anymore because I can’t take the chance of pregnancy.

Every month I seem to find pregnancy symptoms , weather it be from dehydration or a simple cold. I’m tired of always being so anxious.