Short, light period.

Okay, so it's very common for my period to be out of whack. I'm very irregular, but I'm not on BC or anything. My last period was in January, ( 3 months is a little long without one, but nothing alarming with me). I finally got it 2 days ago, buts it's been real light, and today I'm off. THAT is uncommon. I have no other pregnancy symptoms, but I'm getting nervous now. Does anyone know what's going on?