Unusual period

Hi all,

My periods normally come on the 8th of every month in the morning with a very heavy flow lasting to the 13th always, but this month my period did not come to the 10th it isnt heavy at all, it started off with drips and now a light to moderate flow very thin doesnt really require a pad. About 2 weeks ago i had very tender and sore nipples, recently i feel a little tired than usual i normally go bed very late say about2pm but yesterday i was yawning from 10pm. I have had no to very minimal cramping all day and normally its a constant pain for me. Ive taken a few pregnancy tests and all negative but something deep inside of me thinks i am or maybe i want to be? Something just doesnt feel right.

has this happened to anyone before and been pregnant? 

Kat9 x