They saw to give your body a month off in between to return your body back to normal after all the hormones being pumped in. So if you get AF this time, you need to go the full month before starting next month. But saying that it depends if you do a flare cycle or a down reg. Down reg you have to be on the pill for the month before anyway, where as flare you might be Ok to have another go straight away
However, if you have done a natural thaw with no drugs, you should be able to do a stim cycle straight away
good luck!!!!