Bleeding during Pregnancy

A week ago I took a pregnancy test and it came back positive. Just to make sure, I took two more. Also positive. Today I woke up with some bad back pain and cramping. Went to the bathroom and I’m bleeding like a period. I don’t know whether to worry or not. My husband and I still have to enroll me in Tri-Care so I can’t go into the ER just yet. Any other mommas-to-be have any problems like this? Should I worry?