Beta hcg declined from 165 to 130 in 48 hours. What does that indicate?

Athi

I got my beta hcg tested on 12th (18 dpo) it was 165. Today when tested, it was 130. Is there a problem? Anyone?

I do not have any spotting, bleeding or cramps. Started taking folic acid tabs from yesterday. Can it be the reason?

Update: It was an ectopic! I had an ultrasound today. But not severe.