Lipoidal Flush - when did you have one?

What day in your cycle did you do a flush? I'm scheduled to have one but it falls on cycle day 13. But could be 15 as I had two days of spotting which I don't count as day one (I've been told to count day one as first full flow) I'm worried I'm going to flush my egg out, and although we've never caught one, it's only my second cycle after a lap, hysteroscopy, dye studies so I'm worried about ovulating around the time of my procedure. Apparently the surgery increases your chances of conceiving naturally for the first three months. Unfortunately I can't change the date. Did you have a BFP after? I'll be having a FET my following cycle.