Braxton hicks or possible contractions?!

cassie
35w 3d...this morning ive been having a cramp/sharp pain radiating from my left side of my lower back to the front of my belly...causing me to want to hold my breath a little..they have been coming and going for the past 40 mins and last about a min maybe less and coming about every 10-15 mins depending on what im doing. I know im hydrated so just curious..ladies??