Spotting and 5 weeks pregnant

I've been having minor cramps off and on . My discharge was a bit brown. Last night and this morning I was cramping so bad that I thought I was having a miscarriage. The cramps stop by itself. This morning I wasn't spotting at all. But I just woke up from a nap and the spotting is light pink. It's not much. I'm not cramping at all. I have a doctor appointment tomorrow. Should I be worry. I'm really trying to not freak out.