Hello, i was expecting to get my period today, instead i only have light pink spotting when i wipe. my period usually starts of pretty heavy, so this ?

Irregular bleeding: This is may be normal but you should take a pregnancy test if it is even a remote possibility. Wait and see what happens.

Many things: dysmenorrhea. this can be due to many things, from hormonal imbalance, to structural issues such as fibroids. I would need to know more symptoms to help you on line. Do you have a history of this? Any pain? do you have a history of gynecologic issues? How old are you? Then we get into things like hot flashes, emotional issues.