Scared

My period has been over for three weeks now. And doesn't usually start for another two... Never in my five years of having periods have I bled when I am not on my period. I just went to the bathroom and there was blood everywhere. It didn't look like the usual period blood either... I didn't even feel it happening. Always a day before my period starts, I get bad cramps. But this, nothing! Total virgin here! Kinda scared that something is wrong?? (Note: not on any kind of birth control)