Clear blue digital

Took a clear blue digital test the day of my missed period (Monday- day 29 of my cycle) around 5 PM and got a not pregnant, still haven't started and no signs of AF- my boobs generally really hurt before my period and they haven't yet.  I have been having a light twinge feeling mainly on my right side. Headaches off and on, extremely tired even though I'm getting 8+ hours a night, dizziness, vivid dreams. Don't want to get my hopes up but... Could I be....?