Braxton Hicks!

Im 21 weeks and 1 day and today ive had alot of braxton hicks they were just coming and going now i feel like there coming on a lot more this evening i been drinking lots of water so im pretty sure its not dehydration, i tried a warm shower rite now and got a few cramps during the shower so i got out and now im laying down on my left side and i had one since ive layed down but now my tummy feels a little sore from them all day! But so far havent had another one yet should i just continue to rest and lay down till tomorrow? Or should i not even be worried!