Sarah - ... for me, it wasn't just 3 fails, it was 8 ... #9 brought us our BFP ... and our doctor had kept saying to us, that he firmly believed it would work, he just didn't know how long it would take. The first 5 tries were with a different doctor at the clinic and in November 2012 we switched. Right away, our tries were more promising with the new doctor, but we weren't quite there yet. Did scratch biopsies and various other things to try to optimise our chances ... February 2013 had OHSS, so for the July try he changed the protocol a bit - two beautiful blasts transferred and a Chemical. Before the transfer, after the transfer and late August I had colic attacks from my Gallbladder - that needed removing in September. Next try, November - again slightly modified protocol - again perfect blastocysts transferred - again Chemical. February this year, again slightly modified protocol - beautiful hatching blast transferred - BFP. Oh and from February last year, we had all fertilised eggs monitored in an Embryoscope, which also optimises the conditions (I think that also contributed to the better quality and development).
So I think it is a lot of different influences that contribute to how it all works or doesn't work. Just because they fertilise, doesn't mean that it will end up in pregnancy (I also thought it would work first try!!) - and there may be nothing wrong with us DNA-wise - and still, when sperm and egg fuse, there are chromosome anomalies... and that is just nature
I somehow always believed. But because we were entirely out of pocket for the whole treatment, I knew there had to be a limit. Beginning of the year I said - "I will be 40 next year, if it hasn't worked by the end of the year, we are stopping". Luckily, our first try this year was it