Light period?! Tmi.

My af started yesterday.. but all day it was so light it didnt even show on a pad.. only when id wipe. Well i woke up this morning expecting it to be heavy like normal.. but it isnt. Its still so light! There is a little on pad today but its on and off totally not normal for me. Im usually heavy flow. Ive also had really bad diarrhea?! Woke up in the middle of the night last night had to pee, stomach was hurting. Again nothing on pad just light pink barely there on toilet paper. I just feel off. Idk, im not thinking im pregnant. But just idk! Please give me your thoughts!