Hi Jen,
I know just how you feel. I am also on my 3rd go since December and I'm also on my 2ww test on Thursday(if I go that long as usually get AF before) - you are only a few days behind. I don't know how I am going to cope if this one is a negative - I think this will be the end for us as well after 5 goes and around £16,000 later!!
Last cycle I asked about tests to be done, but they didn't feel that I needed any and went through all the tests and gave me good reasons not to have them. However, if this one fails, then I think I will insist on every test under the sun. We have had assisted hatching this time which was the next step to hoping the little buggers would stick around - have you considered this? I'm sure some of the girls will post details of the tests they have had and whether they thought it was worth it - it would be interesting to know.
However, I'm saying never say never. It could well be BFP's for both of us - you just never know and you should try not to dwell on it until it happens, well too much anyway.
If we both get BFN's then we can support each other through it, but until then we need to try a little bit of optimism, if we can
I'm wishing you all the luck in the world, I'll keep an eye on you.
Love Sharon X