1MP- What is the op for? Will it improve your chances of getting/staying pregnant? If so id be tempted to save at least one embie for next year. In terms of transfering 1 vs 2. I have only ever done one at a time but that's only cos its the standatd process at my clinic. I have heard the 2 transferer at once can increase success rate but I have no idea if that is actually fact or rumour.