Off the pill & having some questions

I decided to go off the pill after being on it for like 4 years. I want to start tracking my cycle and fertility naturally. I am NOT trying to get pregnant but I think getting off the pill will make me feel better overall. When would be a good time to start tracking all of that after getting off? Can I start having sex right after coming off of it? I am currently on my sugar pill week and will not be starting a new pack. I just don’t know if tracking my cycle/fertility will be accurate if I am just coming off of it. Any advice or suggestions would be very appreciated, thank you 🫶🏼