I need to stretch!!

I'm 27+2 and i keep waking myself up cause I want to have a giant stretch of my tummy and back and legs but I get a pain in my tummy when i try to stretch.. I can't stop doing it because I'm half a sleep.. I have no pains afterwards just while I'm trying to stretch... I hope I'm not causing any serious problems.. does anyone have this same problem? Any tips or advice??