We got lucky on our first transfer (second cycle, but first transfer as we had none to transfer on the first cycle).
I'm not sure anything really gave us an edge, pretty sure it was just pure luck. My egg and DH's sperm have issues getting together. They can't seem to penetrate the egg and just swim away. As soon as we used ICSI on our second cycle, all was good. I didn't expect our first transfer to take though, just very lucky.