Cramps on one side..?

Dia

I have this one side cramp on my lower left side on my back.Im getting these sharp menstrual cramps also.Are these just Braxton Hicks ?It's been going on for 2hrs now.Im 37 weeks and 2 days.Did anyone feel this or know what this could be?I called L&D; they just said to wait until the cramps get unbearable and if it does to come in.