On antibiotics can it affect a baby

I'm not sure if I am pregnant cuz I'm now four days late on my period I have tested BFN for the hole four days we have eased of on having sex now we have it every other day could it be that I'm pregnant but it's just not showing up and also I have a uti witch means i have antibiotics could that harm a baby if I'm pregnant I told them I have missed AF FOUR ABOUT THREE FOUR DAYS now and I had the most tinyest amount of pink discharge as well what do you all think I should do wait or test cuz I'm having no luck at all these are the antibiotics I'm on