I had sex while on the pill but also two weeks after taking antibiotics, which is supposed to weaken the pill. I missed one pill in that time but got back on track. I was supposed to get my period on the 26th (6 days ago) but never got it. I started a new pack of pills 2 days ago. In the last week I have taken 3 home pregnancy tests and they were all negative. Could I still be pregnant?

Could you be? Yes, are you ? Most likely not. You could have many reasons for late periods, so if in doubt, have a medical check up for a better test