I would give the embryo a go. I am glad we don't have any remaining as I wouldn't feel like we are done if there were remaining embryo's. I think you just need to be prepared for the fact that the embryo may not thaw too, you may end up with a 3rd child, you may not. Personally I didn't find having a third difficult, if anything ds3 has been the easiest. A 3 year gap between our 3 is awesome though we feel.