Depo+antibiotics

Im 8mo pp and haven't had my period in month. I was recently hospitalized for a bad UTI and was put on antibiotics. I'm also on the depo shot and I know how antibiotics affect birth control. Me and my fiance almost never wear a condom because they make sex painful. In the heat of the moment I forgot about the affects the antibiotics can have and we didnt use a condom. Now I'm scared that I might be pregnant. Has anyone else had this happen to them. Not even sure when I could take a test or if I even should. I got the same feeling I got when I conceived my 8mo baby and my 2 angel babies.