Helpppp!! Slow rising HCG!!

Hello everyone, so I am really nervous. Last Friday I had my HCG levels taken and measured at 8328. I have a gestational sac and yolk sac measuring at 6 weeks 2 days. Three days later on Monday I had my second hcg levels taken . Today I found out it is only 9762. I am now 6 weeks 6 days. Is this normal ? I’m worried because my OBGYN said it maybe a blighted ovum. I have not had any bleeding or cramps. I had sore breast about two weeks ago which was the only symptom I was feeling but now that doesn’t bother me anymore.Please help any Similar stories? Outcomes please