Help me start temping please??

Ye

So I am on cycle day 2 so I was wondering when I am suppose to start temping? After or during my period?

Should I start the day after my last day on my period or what cycle day do I start. Im usually irregular but I am taking vitex and geritol (which both are the reason why I had a shorter cycle this round) so when should I start?

Help me please I want to do this right!