Try not to stress to much about it. I also had a miscarriage in May and then got pregnant again in June. I had heavy bleeding with this one for about and day for no reason, but so far everything is fine. I'm 28 weeks now. It's not always a sign of miscarrying. If you're really concerned, go to the hospital and get checked out.
My last two pregnancies where similar to what you are seeing- I had a miscarriage with one- had light bleeding and no pain, ended up losing the baby. A year later we were pregnant again and again had the light bleeding- I went for my first ultrasound prepared to hear bad news again- but our baby is 6 months old now. Bleeding can be a sign of miscarriage, but that isn't always the case. I hope things work out for you- let us know how you are!