Isn't it weird how they show up .O.V.E.R.N.I.G.H.T?!?!?! They're actually there for a while, they just don't become visible until they are stretch to their full capacity!! I didn't have not one stretch mark on my body until my 30th week and I swear they spread like wild fire!!! I'm an estitician and deal with the skin, for me, this is an outrage and disguisting...But it's mother nature. When your body stretches past it's limit, the skin stretches, no matter how much lotion you apply. I am an avid user of coca butter massage cream, and it does reduce the appearance, it could never cease stretchmarks from happening....So don't feel bad, you're not alone!!
Good luck...I hope your baby comes whenever he/she's ready!!
Sarah