One of my daughters had a partial molar pregnancy two years ago. The baby seemed to be doing fine for a while, and then everything went wrong and she died. My daughter and her husband were devastated. Then she had to get checkups for several months to make sure she didn't have cancer.
The good news? They're presenting us with our first grandson in a couple of weeks. They've stayed in very close contact with the doctor, for obvious reasons, but everything has gone well this time.
Be patient. I'm the type of person who prepares myself for the worst and then can hope for the best. Hope you are, too.