5 months after d&c no period, positive pregnancy test today

I had a miscarriage in September and a d&c in October, I remember taking a pregnancy test after the miscarriage tht was negitive, I wasn't trying to get pregnant but wasn't avoiding either. I'd be over the moon if I was but was waiting on on first period, anyway I fet different and took a test this morning tht was positive I'm just wondering if my hcg could be left over even tho I got a negitive test a few months ago? Just don't want to get my hopes up so going through all the posssiblities lol