Need help

Taylor • Mommy to two angel babies 👼🏻👼🏻 and two boys earth side. Paxton 3/6/2020💙 Luka 11/21/2021💙
So me and my fiance went to the hospital on Saturday and found out I was pregnant but they couldn't find anything in the ultra sound . Started bleeding heavy went back and they said I was having a miscarriage. They took blood and my hormone levels where at a 16 which 6 and up means your pregnant. Went to the ob had more blood drawn and within a week it only dropped down to a 15. And I just took a pregnancy test and it showed I was still pregnant? Anyone have this happen to them or know someone that has had this happened trying to get some answers.