March 5th is the first day of my last menstrual cycle (30 days), on April 11th my period was late and I tested beta and it was 3356. On April 15th beta was 16,561, ultrasound showed the fetus was in the uterus. The doctor prescribed Utrogestan 2 pills/day + Nospa 2 pills/day. On April 21st beta was 10,800, ultrasound showed the fetus was 5w6d, there was a fetal heartbeat. The doctor maintained the old prescription + added Duphaston 2 pills/day. So can I keep the pregnancy? Why does the beta decrease but the fetus is still developing and has a fetal heartbeat?