Maybe preg. After miscarriage?

On April 24, 2012 I had a miscarriage ( natural no d/c). I stopped bleeding about a week later. My husband and I continued having "relations" . On the 22 of this month I went to the doctor for a check up and preg. Test was negative. My doc said I should be starting my cycle soon because I had a lot of clear discharge. On the 25 I took a opk and it came back positive. Today I took a home preg. Test and I saw a faint positive. Could this be a new preg.