Don't need to answer this online but just to put it out there, Like trish suggested is it just the lips? Ar eyou normally a innie or a outie? I your a innie then I would think its just the lips but if your normally a outie then you would be able to tell what it was & would know its normal.

My other thought would be a prolaps. My sister had this happen but it was after the birth not before... But she descrbed it the same. I would be going up to the hospital & asking to be checked out, you don't need that kind of worry at the moment.