Hcg dropping.

My hcg has dropped since 9 weeks and I’m almost 13 now. I had some spotting so they checked it. It till very high but it ha dropped since then. I had an ultra sound yesterday and baby was fine HB was 157 and people are scaring me saying I’m having a miscarriage (not the doctors) but they never said my hcg dropped I checked online. Anyone else had this and was fine? Found the HB on the Doppler tonight too.