Moody while ovulating?

I have been an absolute crank all day today and Glow says my fertile week starts Monday. From what I've read online, irritability and sudden mood swings are a sign of ovulation. Could Glow be a couple days off or am I just being a jerk for the fun of it? This is our first month TTC so I don't have a lot of data for Glow to make an accurate prediction from. I haven't used any OTKs so I'm going off of my symptoms and CM to tell me if I'm ovulating. I'm also bloated, tired, and a cross between nauseous and wanting to eat everything. Helllllp.