For the past 2 days I've been having pains in my lower back and lower stomach with some pressure…

For the past 2 days I've been having pains in my lower back and lower stomach with some pressure especially when I have to pee? could I already be having Braxton hicks contractions also the app baby bump pro that I'm using says I'm 29 weeks and 2 days today could it be right. it goes by ur due date and mine is April 2nd 2016!