So I Know This May Seem A Bit Weird. But

So i know this may seem a bit weird. But my name is brianna. I had ny period not to long ago , approx 1 and a half weeks ago. And just starting last night... I felt a gush of blood. Didnt hurt or anything but bright red. And now im having a little cramping . and its a brownish color now. This is very un usual for me.. Should i see someone immediately?