Signs on Day 3 NoFap

Hey guys, I just started my Day 3 and I have a question. I don’t know which mode I am but i know that I’m not masturbating and watching porns. I dont know if this is normal or not, I’ve been having boner for no reason, sometimes during reading non-sexual chats, posts, etc. Is this normal? Is this a good sign?

Are you feeling brain fog?
And please don’t read those chats , Avoid every sexual content.

What’s a brain fog? I don’t understand. Noted about the chats.