We have tried it for a few months Lizzie, for the same reason. It did not work but that is cos I am too old. I researched it on the internet and there were some tips you need to pick up which I can't remember (sorry - not much help) You need to search international sites, not just australian. It has to be not too fresh but not too old as well (i can't remember exact details) as it changes in consistency. Can't remember if it is a 3 or 5ml syringe that you use.
Gay women used this method before IVF was available to it must work.
good luck.