left eye is reddish/pinkish?!

Yesterday when I got to school, my friend David told me that my left eye was red/pink.. But it didn't itch or anything. And now again this morning I woke up and my eye was red/pink. It hurts to open it too. When it's open, it's all blurry and itches. No, wasn't touching my eye. Yes, I have contacts. What caused this yesterday and today? And no, it's not allergies. I'm only allergic to cats and hay. I'm not around either right now. Besides allergies, what could it be?