Opks-should I use them?

I have 4 left. I wasn't planning on using them but since I only have a couple left I mine as well just see. I'm thinking of taking one tonight and if it's negative I will try twice tomorrow. I'm cd 12 and I have had positives before on this day so who knows. I have been drinking a lot of water so I'm going to wait until 8:30 tonight. We are bding a lot so do you think it's pointless to use opks? Part of me wants to know when I'm ovulating but then again I want to just have fun and not worry about how many dpo I am.