S.H.
Hi L's Mom,
I'm sorry for how you're feeling. I know you're troubled, but I don't think you should worry at all. If there were anything wrong, she is obligated to tell you right away. If she has concerns, she'd let you know. No doctor would allow a woman who is at 18mos. to be uncertain of the viability of her baby. That would be a moral travesty. Think about it, if there is something that would make a baby unviable or totally deformed, women do still have choices at 18 weeks but not much longer. She's not keeping you in the dark.
She said that there is limited visibility. That has everything to do with the baby being in the wrong position. It's just like not being able to see the gender -- you just go back when the little peanut has changed positions.
If she had cause for concern, she would have been upfront about it. It would be morally reprehensible to do otherwise, and not matter what her moral opinions on choice are, that's a lawsuit no doctor would be fool enough to deal with.
I have lost 5 pregnancies and at the fist sign of distress with each one that made it to an ultrasound, I was told of the doc's concerns right away.
I wish you a peaceful pregnancy and a healthy baby.