bleeding and discharge

so I'm pretty sure I'm worrying over nothing but here it goes. I am 7 weeks prego, with a baby I've tried for 5 years to concieve, and yesterday after intercourse I bled briefly bright red. I called the nurse who assured me this was normal and if I had anymore concerns to call. Well today I've noticed I pink ting to my discharge and if course I'm freaking out. everything else is about the same no other symptoms and no cramping. however I did start amoxicillin yesterday for a uti. any idea of what's going on or if I'm over reacting?