I agree talked to your doctor I had miscarriage last year this time my doctor check my progesterone I took it from five weeks to twelve weeks I just turned twelve weeks yesterday and stopped the meds. I go in four days for my twelve weeks NT scan so I can't say how things are yet however I did have a lady tell me she did same and is no twenty weeks with no problems
I understand how hard a miscarriage is. However, waiting doesn't change the outcome of the pregnancy-sometimes the embryo just doesn't implant correctly or it's just not strong enough. The ultra sound will not cause a miscarriage. It's actually good to get one. My dr does a simple internal one at the 1st visit, this helps them determine how far along you are, & if the baby is implanted correctly. Also talk to your dr about Ur miscarriage sometimes they will put you on progesterone which can help hold the pregnancy (my girlfriend was put on it after back to back MC). They can't actually determine the sex of the baby until 16-20 wks. If you want to determine sex & health of baby earlier you have to do 1st trimester screening (I did the Free Cell DNA testing but there is the Harmony test amongst others). Good luck. Try to relax, easier said than done, but take it easy get rest & try not to feel stressed. Stress is so bad on U & baby..