What to expect during mc?

I'm 4-5 weeks, started bleeding w labor like cramps/pain at 7 this morning. I'm still in bed still bleeding with a heating pad and lots of tears. What can I expect? I plan on going to the doctor Monday am but I'm not sure what's normal and what's not. Will this last a few days or a few hours? How soon can I get pregnant? My heart is broken for my baby. At this point I know it's still a bunch of cells but it still would have been my baby. My husband doesn't really know what to say.