Typical "No Period - I'm worried I'm pregnant" post

SOMEONE PLEASE HELP!

I am 8 days late on my period. When having sex with partner I have always used protection. The only thing that I have been worried about is that I'm not on any form of birth control.

I took a pregnancy test on the 6th day after my missed period and it came out negative. I have been experiencing headaches, cramping, and discharge for the past week, but still nothing.