Feeling cramps--- need advice!

I'll be 37 weeks tomorrow and all day today I have had menstraul like cramps. They are not accompanied by a tightening, but I have had Braxton hicks without cramping throughout the day too. Nothing has been consistent...but do you think I'm in the beginning stage of labor?? Tomorrow is my nephew's birthday so I'm hoping this lady holds out until at least Monday!! Any advice would be great :)