C.G.
They are a class C, but if she is not taking them on a regular basis, she is proabably okay to use them when needed. Being in pain, vomiting, not eating....this all adds stress to your body which is probably more dangerous to the baby. If I was in her situation, I would take the T3 only when nescessary. The only time she may not want to use it is when she gets closer to the end of her pregnancy. I would proabably stick to T3 and try to avoid the Percocet (it causes less respiratory distress on the fetus)