Cramping without a period.

Sharee
So, I haven't had my period since July and recently I've had a lot of pressure, or what I first thought was gas, in the lower part of my stomach just above my hips. 
I haven't taken a test to see if I'm possibly pregnant, because I'm used to having irregular periods but I've never had the pressure in that part of my stomach before. 
Has anyone else ever experienced this?