Hcg levels- please help

KM

Hello. I had a chemical in March 2020 and then a missed miscarriage in January 2021 which resulted in d&c in February. I had two normal cycles after and last week at 12 dpo I received my first BFP. I had a blood test that day which came back as 60hcg then 5 days later I got the repeat and it’s only 135 hcg. I read that if you test very early it takes time for the hcg to double every 48hrs - 72hrs. Does anyone have any success stories or do you think miscarriage is imminent?