When does nesting start??

Jennifer • Had baby girl
I'm almost 22 weeks pregnant and my mind is constantly running about everything I need to get done before baby comes. I'm so exhausted so it's hard but today I was sitting on the couch and all of a sudden I got up and started scrubbing and bleaching my floor in the entry way. Maybe it's because my birthday is on Saturday and my boyfriend invited his grandpa and my parents over for dinner. But could I already be starting the nesting phase?? I feel like I'm going to crawl out of my skin with the mess around me. I want everything clean and I want it clean now. I've never been a clean freak but I can't stand clutter. I feel like I'm running out of time before baby comes. I have nothing for baby yet. Any advice or input would be great thanks.