Absolutely it all depends in whether or not you are open to the possibility of a multiple birth. We did several single ET, all if which were bfn and, as we had so many fert issues, we decided to throw all our eggs into one basket so to speak and transferred our only two embryos of the cycle having decided we were done should it fail. We were thrilled that we were lucky enough to get twins from that cycle, it means that I don't need to weigh up the minuscule chance of ivf working again for us a few years down the track because we have our family. In saying that, don't get me wrong as I love my girls to bits, twins are no walk in the park. It's damn hard work and I do find myself having pangs if singleton envy. But, I wouldn't swap my girls for all the tea in Chiba and I wouldn't have it any other way. Only you and your DH can make that decision. Good luck