Teni-i have had that with every pregnancy when i sneeze and i dont lean forward it happens and this pregnancy has been the worst for it everytime i even sit up to quick using my stomach muscles ouch! i feel like i have torn a muscle and when i asked the doctor about it he said it was normal and my muscles are in good nic its just pregnancy related and everything loosens for bub and will return to normal but i can tell you i dont use my stomach muscles to pull myself up anymore and i roll onto my side before i get out of bed.