34 weeks and suddenly highly irritable, anyone else?

Maggie • 41 year old new first time mama. Baby Sasha was born on 10/3/2017!

I've been pretty even keel throughout this pregnancy. Though I've definitely had some crying moments, and some bad reactions to things, nothing has been severe or of any duration.

Suddenly, last night I just started feeling really irritable, like really bad PMS. It wasn't in reaction to anything, and it's just sticking around like a fog now.

I'm a little paranoid that it's an early sign of labor, but I'm only at 34 weeks, so it's not time yet! Anyone else having a sudden late mood change?