Hi mama! This is actually a really important medical question, please talk to your OB about dexamethasone timing, lalo na if you're dealing with pre-ec, kasi iba-iba talaga depending on your situation and how far along you are. A few of my mum friends went through similar concerns, at ang best advice nila lagi ay to follow their doctor's plan exactly, walang one-size-fits-all dito. Your OB knows your case best, so don't hesitate to ask them directly about the when and why. Take care of yourself, mommy!