Early miscarriage slow dropping hcg

Sarah • 27. Married. My son was born 2/22/16 and his little sister 7/5/17

I miscarried early around 6/7 weeks my levels only ever reached 3600, dropped significantly to 1000, then 130, 36, and now 32.... it’s been about a month I’m just a little curious as to why it’s taking so long?... I’m tired of dealing with it all and going in every week to the lab. Anyone else experience this ?