I'm 11 weeks and 3 days, had my last sono at 9weeks. Everything looked great, heartbeat of 150. I go again at 13 weeks, and even though it seems to all be fine I find myself obsessing over missed miscarriages. I had a complete miscarriage back in November at 6 weeks and 5 days. Symptoms and everything have been the same.. however I am taking a progesterone supplement (low prog at 7 weeks) and like I said it all seems to be progressing.. but I am scared to death of a missed miscarriage. Especially since I'm taking supplements, I feel like if I were to miscarry, God willing I don't, I wouldn't even know because the supplements. Long story short... when generally would you say it's most common to have a missed miscarriage? How common are they? When did you have your peace of mind? Planning on getting a fetal doppler soon.