Symptoms

Kelsey
Soooo, I'm supposed to be on my period now I'm getting all the symptoms (cramps, major headaches, back pain, and wanting to sleep more)  but no blood... Is this normal???? I've been like this for the last 3 days; I should started 5 days ago. I haven't had sex (we used protection) since early May and I've taken a pregnancy test to be sure but it came out negative.