15 days late negative pregnancy test ?????

My cycle are 32 -34 I'm late 15 days to be exact I have never been more than a day or two late I have been cramping but on my left side like for 30 mins or less each time took a test today after work an negative bug my pee was light yellow (sorry) but I wouldn't think that would matter this many days late sdischarge when I wipe sometime I feel like I peed my pants an Nothing there I'm so confused my boobs hurt idk what's going on :(