I had a really bad day of BH and the following day i had a sore tummy like i had pulled a muscle... ( i had been drinking RLT the day before)

Is it possible that you have been having BH and not know it. Mine were painless and i would just feel my tummy go hard and then soft - alomst like bubs was moving up and then down. it was quiet subtle in some cases and TBH i had been having them for weeks and not knowing it !!!

HTH, go put you feet up or have a warm bath like others have suggested... it should ease in 24hrs if it is muscle related...
You body is just getting itself ready for the big day