Possible Pregnancy?

Hello all! Ive taken tests before and im not just going to ask if i am or not. I simply want advice of those who have more expirence with these types of things. Im on the shot and before i was on the pill. I got sick this past week with strep and have been taking antibiotics and my doctor warned me that antibiotics lessen the effect of birthcontrol and i was stupid and in the moment let my bf come in me. But my saving grace was one, realizing i was on my 'period' (i dont bleed anymore but its still on the track thingie) so i figured im safe. Just wanting an opinion. Also, every test ive taken in the past have been negative so thats a positive. Thanks for reading!! Comments would be helpful