First of all i'm sorry about the miscarriage. I had one back in march, if I was you I would be calling the doctor and getting in there as soon as possible and having ultrasound done. And I would ask to be watched closley. In my case I would be cause of my first pregnancy, with my son and then the m/c when was because it was ectopic. Oh, and congratulations on the positive. I hope the pregnancy is susessful (sp?) if you ever want to talk pm me.
Best of luck to you
oh and to reasure you bout the sysmptoms every pregnancy is different. With my son, I didn't have no sysmptoms at all, we had just bought a test and I took and it turned positive, so I wouldn't worry much on the sysmptoms.