Uy, I'm so sorry you're going through this, it's really scary. Please follow up with your OB right away or go to the nearest hospital if you're having any bleeding or cramping, okay? This is something that really needs close monitoring from your doctor, hindi lang online advice.
A few of my mum friends have had similar situations where the dating wasn't quite right at first, so don't lose hope yet, but your OB needs to see you again soon to check properly. The UTI thing your doctor mentioned is worth taking seriously too, so finish any treatment they give you. Sending you lots of prayers, mama. Kaya mo yan.