Miscarriage

Today I went to my doctor appointment for ultrasound to make sure that everything is out from the miscarriage everything is good it's only a tiny clot left and they also did blood work to check my hcg level since I was sexual active 2 weeks after miscarriage my miscarriage was on October and my hcg level on October was 15000 today it's 32.5 they don't no if its from before or if it's a new pregnancy so they want me to go back in 2 days to recheck my levels what do ya lady's think ?