I think you need to see your gynecologist. It is possible that you are pregnant. I am not a medical doctor however, and I can't diagnose what is going on. Don't sit around and wonder about it! These are the kinds of things a doctor can quickly give some feedback on- but he or she will have to see you!
the veins i am sure have always been there and now you are noticing every little thing. the veins are more noticiable when you are cold too.