Should I be worried?

I’ve been having this dark brown spotting, usually just when I wipe, sometimes on a panty liner since I found out I was pregnant. About 5 weeks ago I thought I was actually having another chemical, but my OB had me come in for two weeks and said my HCG went up. I have an appt next week for my first ultrasound, but I’m cramping and not feeling very comfortable on mostly one side. She said I would be about 7 weeks according to my HCG... I’m getting really worried I’m having an ectopic pregnancy and was hoping for some other insight before I freak out and go to urgent care. Thanks.