Scared..

Ok so please I just need to be talked down.. I found out I was pregnant at 20 weeks ( I have very irregular periods, no symptoms, wasn't showing, and on BC) and at my first dr appointment I got treated for clamitya (please don't judge... Me and my soon to be husband hit a rough patch broke up and yeah. It's the past) and I have a dr appointment this Friday and I'm just terrified that they Will find something they didn't see last time.. Either first time they said me and baby were very healthy, but just from the medication and the clamitya, I'm worried could have caused something bad to happen... ??