freq urination due to preg or uti?

Stacy
I'm just over 14wks w/twins. Have never had urge to pee frequently this whole time. In fact maybe only go 3x a day (had trouble eating/drinking due to MS).  
All of a sudden today, I have the urge to pee badly every 5min. And there's not much output.  But it doesn't burn. No blood. 
Stomach also feels tender when I bend over or push on it , like a gas cramp. 
I'd see a doctor if I were home, but I'm in a very remote little town that is  closed down daily 1-6pm and on weekends. Tomorrow is Sunday and everything will be closed anyhow. 
Has anyone else had this ?