Thanks for writing.
Constant dull pain in upper abdomen is not labour pain.
If your pain is in lower abdomen, radiating to thighs and back with gradually increasing intensity and duration with no relief even after rest and hardening of the abdomen with every pain then it is probably a labor pain
. Besides labor pain is associated with mucoid or watery vaginal discharge
or blood tinged mucus .
If you have these, you should visit your doctor for an internal examination.