How soon did you bleed?

Jodie • IVF warrior - Expecting our rainbow April ‘23🌈🌈🌈

I was put on birth control for 21 days before I start injections, due a bleed in the 5 days before injections. Today I took the last pill, how many days before you started to bleed? And is it okay to do the injections if I’m still bleeding? We’re starting on Meriofert