Not sure what to expect

I know hcg levels above 5 means pregnant. I'm supposed to be 5 weeks 4 days, I started brown discharge yesterday so I called my dr and they had me get a bloodtest. When I woke up I had a bright blood, not alot, just like starting a period and no pain. The nurse called me and said my hcg levels were a 7 so I'm miscarrying. She warned me about bleeding through a pad every hour to go to the ER and if I have pain they can prescribe something... but I guess I don't know what to will there even be a growing baby to pass since my levels were so low? I've passed some lining and clots but thats normal for me during a period.