Just wondering.....

I had a miscarriage in October yet period never started again. I have signs of it trying( sore boobs, cramps, nausea) Had hcg levels checked weekly to ensure they were going down. Took urine test a last week and all pregnancy signs say negative but just getting the results for the blood work and it says 150 and they need to repeat it. Could this be a new pregnancy or just hormones taking longer than it should to leave my body? Confused