Okay 38 wks 4 days pregnant and this morning i have woke up with this horrible bloating. I have taken Tums I have drank…

Okay 38 wks 4 days pregnant and this morning i have woke up with this horrible bloating. I have taken Tums I have drank some coffee (which generally cleans me out) NOTHING! What could this be? Anyone else experience it? Baby still moving but when he moves its alot more painful, walking doesn't help. . Please advise on what could be? Going to dr this evening