I need help not sure what's going on?!

Most of the day today my stomach has been semi hard while sitting as soon as I stand up I have a hard painful Braxton hicks contraction that slightly wraps around my back with the band of pain. I now have pressure and pain going towards and in my vagina. Sorry if tmi I just never had this before and it's constant tried laying down and no difference I'm drinking too. to stay hydrated. Anyone have this or had it and know what's going on?