Could I be pregnant??

I missed one or two pills throughout the week and was late taking pretty much all of them, however the 15th I took two in the same day.  I'm also taking antibiotics(not rifampin so not sure if they affect it or not.)The last three times I had sex we used the withdrawal method, the first time nothing. I'm worried I could be pregnant since I was inconsistent with the pills. My inactive pills actually start Sunday so that's when I should start bleeding. 

Vote below to see results!