Early miscarriage

I was 5 weeks along and on Friday night I got little brown spotting. Went to ER and found out that my HcG levels are only 7, thus I lost the pregnancy. I am devastated, after almost 4 months of trying, we got pregnant and I was on cloud number 9 and now I don't know what to do. I had my first prenatal appointment scheduled for tomorrow which I had to cancel today and now scheduling another one for follow up. I stared bleeding on Saturday and I am still bleeding but it is just like my regular period I think. Is this normal? Since I was so early and most probably my HcG levels are almost to zero by now, how soon can we start trying again? Also can I exercise or do I have to wait? I think exercise can help relax my mind but I am just afraid to do anything at all now.