first ER today. FET next cycle, what to expect?

Got my first retrieval today! So excited to finally, hopefully be a step closer to our baby. A bit bummed since my doctor said at my checkup that I have "too many" eggs and they're not big enough, or at least they weren't last week, so I'm in at risk for overstimulation. She said they won't be able to transfer until next cycle.

But I don't know what to expect, when did you guys have your period after ER? Some say the bled a week or so after ER, but does that count?