Bleeding?!

Hi ladies! I really need some help! Yesterday at work I went to the bathroom and I noticed a light pink blood on the toilet paper. I thought I might have been ovulation spotting (which btw iv never experienced) so I didn't think to much about it. This morning I woke up and i have more darker blood and heavier then yesterday i just ended my period last week on Tuesday?? Throughout the day it's gotten heavier and my pelvis has a lot of pressure on it. Do I need to go to the ER? I looked on google and I can't get a specific answer. Thank you!