Trying to think positive

So I had an ultrasound on monday and it showed i was 2 weeks behind but since im breastfeeding the doctor said it might be because of me breastfeeding so instead of me being 8 weeks pregnant im 6 weeks but just in case we did a blood test for hcg 2 days apart from each other and my levels are going down but it didnt drop alot just very little and i have a another ultrasound in 2 weeks but they said its a big concern and i have a feeling im losing this baby and im trying to be hopeful but with hcg going down im worrying im losing the baby have any of yall went through this but baby turned out ok im trying to think positive