I know 
I'm genuinely not feeling quite as much strain as I thought I would actually. Objectively speaking, this was a 'textbook' cycle (i.e. everything has done exactly what it was meant to do, when it was meant to do it). If it fails, it will just have been down to bad luck at the final roll of the dice but I still believe the cumulative odds are in stacked in our favour - worst case scenario, it might take us more than one cycle.
Had there been a more significant, identifiable problem (poor response to stims, duff sperm, total fertilisation failure etc) I would see this as being a far more serious problem and would be a lot less jovial about it.
Obviously I will be disappointed if this cycle fails, but we have sufficient time, tenacity and resources to try again as many times as it takes - a fact that brings me great comfort. I am also quite surprised by how on board and supportive DH is, he is not the most demonstrative of chaps so he has really pleasantly surprised me.
Really hope it does work though, as I have the opportunity to go on the most huuge adventure in Jan and would much rather be doing that rather than turning myself into the human pincushion again! 
I keep thinking of a post I saw on here from someone whose name escapes me for the time being who was talking about women with fertility issues. It has always stuck with me and reassured me...
She was effectively saying that of all the (many) people she knew who wanted to achieve motherhood, they pretty much all did so by one way or another. Either naturally, via IVF/ICSI or surrogacy or indeed adoption. SOme paths took longer, and were more painful/stresful/expensive, but the number of journeys that didn't reach that goal in one way or another was vanishingly small.
She put it much better than I just did (it sounded rather less trite from her too!), but I often hang onto that thought though in the darker moments.