Reflux?

Our LO is 2 months and is currently on meds that can possibly include reflux as a side effect. It's getting to the point every time we feed him he constantly wiggles around, chokes a bit once he first swallows, spits up after every meal (although not much) if you barely touch him for pretty much a few hours later, and randomly gags/chokes while sleeping. I called our pediatrician so don't worry I'm getting actual medical advice as well, but was just curious on when you mom's with reflux babies knew?