Urge to #2 like all the time...

I'm 28w4d and for the past 1-2 weeks I've felt the urge to go to the bathroom like all day and sometimes I go 3-4 times a day and that is not like me! At my last appt 2 days ago my doctor checked and said baby was already head down (I know he can still turn at this point) but why am I feeling this way with pressure down there? Is it normal at 28w? Everything I'm reading says they were closer to 40w when they experience this and it's their body prepping for labor.