WHAT???!!!!

Okay so I was getting ready for work this morning and noticed I had some red lines on my boobs. At first I thought maybe it was just lines from my bra I was wearing but after checking 20 times at work, they are still there. I asked Gary when I got home what he thought they were and he says definatly stretch marks. How in the heck did I manage to get stretch marks some place tht never grew?? I mean, they have grown a tad bit but honestly I am have always been tiny up top and nothing seems to have changed now that I am pregnant. My belly however that is gigantic doesn't have a stretch mark on it yet......go figure? Now I am super paranoid about the stretch mark thing, now that they have shown up out of no where some place that isn't even stretching??? Oh dear goodness help me now.