Veins?

Last night I freaked out because I could see every vein in my body. Mostly my upper body, such as my shoulders, chest, boobs, under my arms, and down to my pelvic area. They're extremely bright and my skin looks paper thin. I had unprotected sex two days ago, meaning it's too early to be a sign of pregnancy I assume. But I did have sex on May 7th, 4 days before my fertile window and today is May 20th. Any ideas?