period?

Hey guys so. yesterday i went to the bathroom there were blood dots on my Underwear.. i was assuming it was my period (its around that time) Yesterday it filled up a pad and today its filli g up nothing, when i wipe its there its like a light pink with a hint of red. I do have irregular periods. but i dont think its ever done this before... before anyome assumes I HAVE NOT HAD SEX. im not concerned on being pregnant. im trying to figure out wtf is going on.