help when do I start doing my ovulation tests as I came off my pill yesterday

hi ladies I'm type 2 diabetic and we have been given the go ahead to start trying for our second baby as my hba1c is so good. we have a little boy already who is 18 months old. I stopped taking my pill yesterday and immediately started bleeding. Would I class that as my first day of my period? Or do I need to wait for me to stop bleeding and see if I start bleeding again before that is classed as my period? Also when do I start tracking my ovulation is it last day of my period or start now?