Painful stretchmarks?

buttaflly227

So I'm no stranger to stretch marks, my skin is SO prone to them I even have them on my KNEES and I'm not crazy overweight or anything either. So, not being quite far along I've added quite a few more. 

The weird thing is, I have this one certain stretch mark that is darker than the rest and HURTS like a bruise! It's not the biggest deal in the world but is that normal? I've had other ones but none have actually hurt before. Have you experienced this?