I am not an expert at all but I think it might be that when you get triggered not all the follies develop into full blown eggs. I remember my FS telling me that in a normal ovulation a few follicles develop and only one (or two if twins etc) is the 'leader' and that is the one that will ovulate. However with the drugs more follicles become 'leaders' so you get more actual eggs which are necessary for IVF.






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