Help me out guys!

My period is 4 days late and my cycle is pretty regular. If I am late, it's for only 2 days and that's pretty rare. I don't think it's pregnancy because I was with my boyfriend two weeks ago and we only did oral stuff, and I don't think that's gonna get me pregnant. And today, I started getting a clear discharge and I don't even know what that means. I know stressing doesn't help but should I be worried?