old stretch marks itchy!

The last week or so, my old stretch marks from my first pregnancy have been getting so itchy!!! I had my son almost 3 years ago... and they've never bothered me (aside from when I was getting them the first time during that pregnancy). And now suddenly they are driving me crazy with how itchy they are. We're currently TTC #2... does that have anything to do with it? Has anyone else experienced this?