Ovulation questions

I'm new to this... first month tracking. And think I've just experienced the ovulation stage. 
1. When you have the strongest ovulation pain, is that when the egg is being released?
2. Would you have ovulation pain if you weren't releasing an egg? My pain today was very strong so hoping tomorrow my BBT spikes. 
3. Is there a rough DPO when my cycle essentially ends? I.e when my AF should come. To clarify, I'm not TTC this month as husband is away however getting better informed about my cycle for next month!
Thanks all! :-)