pregnancy test positive and bleeding

Hello, I am so scared now and do not know what should do. I am at my second clomid treatment. I took clomid at CD3-7, did my us at CD13, which is 18mm/17mm, and injected ovridrel at CD14. Everything is going well untill today (CD31). I did my ept test(first morning pee) at CD30, showed a BFP, I did again in the afternoon at same day by using another brand pregnancy test kit, which showed a positive again. I did test again at CD31, yes, it was positive. I was so happy untill this afternoon. I felt a little bit cramp and back pain around 3pm, so went to bed for a rest. And I got up a little bit late, I felt some discharge and turned out bleeding. It was browdish, not too much, and later, I got three time discharge, which were all browdish color fluid, I need to use a pad. Now it seems to stop again. I did have very bad feeling now, since I am 35 years old and tried hardly to get pregnancy. I did not if it was mc or just my body wanted to play with me and made me down. Please help and suggest, if you know anything, I tried hard not to cry, but.. sorry. I am just so upset now.