Confused?

So I’ve been on tons of antibiotics for recurring utis and was on flagyl in March. Im on birth control and don’t let my boyfriend finish in me. I’ve just been super nervous because I’ve heard antibiotics dont affect birth control and heard it does. My doctor says otherwise but im just paranoid im pregnant. This was in my pee this morning, I just got off my period but its been really light the past couple months but its still 7 days. Sometimes I get clumps that are clearish white like this. Is this normal? I’ve taken tests but I know my moms all were negative until blood testing ans its scaring me.