37 Weeks and suddenly not peeing as much?

[Surprised26]

For as long as I can remember throughout this pregnancy, I've been having to make potty runs every hour and a half around the clock (2 hours max if I'm really lucky). However, last night I went 4 hours between bathroom trips twice. Once before bed and once through the night. And when I woke after the second 4 hour stretch I didn't really have an urge to go, I just went because I thought I should have to. My drinking hasn't decreased, if anything I drank more last night than I had in a while (at night anyway). Should I be concerned?