Normal?

I have been on Taytulla birth control for like 2.5 months. Never been on it before. My husband finished in me several times the past 2 months but I have been on time with pills except for maybe three days just a couple hours late, then one day like 12 hours late..I had a period the first month on it but this last pack I only spotted blood for half a day a few days before my period was suppose to start and I have yet to have my period its been 1 week since I was suppose to start. Is there a possibility I could be pregnant or can the birth control cause me not to even have a period? I'm wondering if I should grab a test just in case or if I am just worrying myself

Thanks!