Missed Period, Unprotected Sex For 6 months

[Dreamheart1315]

I am 16 and am now 5 days late for my period. I have been feeling nauseous, weak, bloated, fatigued, irritable,and my breasts are quite sore to the point it hurts to walk and I can't even put a bra on. Earlier yesterday (05/31/12) I also noticed some pink spotting. I have previously been on the Depo Provera shot, but my last shot was 10/31/11, and have been having regular periods since March, starting usually around the first and 27th of the month. The last was due on may 27th and has still not shown up. Even before depo I was regular.
I took one pregnancy test a few days ago and it came beck neg. So if I'm not preggo I have no idea what else it could be.
Any Ideas?

[Dreamheart1315]

I am now 7 days late

[Dreamheart1315]

No i haven't and I did another test this afternoon, also neg..

[cluckerduckie]

I'd retest. Have you been under a lot of stress?