OPK Question

So I thought I was not going to be able to have my IUIs done this month because my doctor’s office isn’t open over the weekend and I thought for sure I would ovulate over the weekend. I’ve been using OPKs for the first time this cycle and got the darkest line this morning. Friday and yesterday were each a little lighter than it was this morning.

My question is, does that mean I’m ovulating today or in the next 24-36 hours? Should I try to get IUIs scheduled for tomorrow and Tuesday or wait until next month like we initially planned?

Everything I thought I knew goes out the window when it comes to this stuff. 🤦🏼‍♀️