Help I’m so scared

I️ve been on the birth control pill for about 3 years. I️ haven’t missed any pills this month but sometimes I️ take I️t a little later than normal. I️ had sex with a condom on my period about 16 days ago. I️ just wiped and I️ had some light brown discharge. My back is hurting, I️ feel bloated, and I️ve been peeing a lot but I️ don’t know if I️ am just overthinking. I️ tend to get anxiety about this. I️ve has spotting before like this and it’s about 12 days before my period is supposed to come. Is this implantation bleeding? I️ used a condom, was on my period, he pulled out, and I’m on birth control.