When to get AMH blood test?

[MademoiselleFrenglish]

I know I need to get it on day 3 of my cycle, but I'm really unsure as to when that actually is this cycle.

Yesterday I had the absolute tiniest bit of bleeding in the evening (not even enough to wear a pad) and today is the same. Does yesterday count as day 1? Today day 2, so I should be getting it tomorrow? Or do I wait until there's actual bleeding to consider it day 1?

My periods have changed over the past few months so I'm a bit at a loss.

I thought day 1 was the first day you'd need a tampon or pad op otherwise it's classed as spotting before af

Day one is the first day of full flow bleeding. So not just spotting.