Pregnancy after D&C

Raya

Is it possible to get pregnant right after a miscarriage? By the time I had my surgery my hcg levels were already really low and the week after I had them done I had a check up and my pregnancy test came back negative. I had my surgery February 10th, waited maybe 3 days to have sex again and have had continuous sex since then. Took a pregnancy test today and it was positive. Also would that make me high risk?and should I just call the doctor tomorrow?