Hcg levels ADVICE PLEASE

My last period was November 2nd. I ovulated the 18th. I'm about 4 weeks 4 days...my hcg level was at 128 2 days ago. Today it's 208. The lady at my dr office made me super worried saying it didn't double so the pregnancy might not be viable. Do my numbers seem way too low? I know the "normal" range varies significantly from person to person im just hoping someone can relate and have a good outcome. Let me know your opinions please