Placenta could not be separated from Clots?

It sounds like there's issues with the placenta that are jeoparising this pregnancy, the baby's not thriving (the IUGR or intra uterine growth restriction shows that). Unfortunately, there is little that can be done during pregnancy, just hold your breath, hope and pray. If your wife can carry 4 more weeks, doctors will work to save your little one if s/he needs to be born early, but the longer she can carry, the better. The meds will hopefully help her carry longer or at least give the baby a better chance of survival if born very early. Unfortunately, even though we think we're in control and that our little ones are safest when in our wombs, it the only time in life when we can't protect them, we have to hope that nature is kind and grants a few more weeks. For now, your baby is alive, so be thankful every day for as long as that's true. Hopefully, you will spend the rest of your life being thankful for this fact.