I just switched to the low estrogen pill and didn't know that antibiotics could effect the pill and had been taking the pill and the antibiotics at the same time. I got the the antibiotics from my dentist and they didn't say anything. Anyhow, I'm supposed to be on since Saturday but didn't see anything till Sunday but it was only when I wipe then it went away and came back today but only when I wipe. Nothing on the pad at all. Now if I am pregnant it's not an issue we was gonna start ttc January. I just don't want to start a new pack of pills and be pregnant. Mind you the wondfo tests have all been negative. I took a walmart test before my AF and saw a faint line but the frer was negative so doubted the walmart.