Oh dear, LST, what a shame to have tears before breakfast
I dont know what to say. Its so great that despite your own concerns, you feel excited, and of course its going to be hurtful that the old discussions are back. And yes, we can all relate to how DH feels, thats why we are all here instead of surrounded by three ribbon-bedecked blond bobbed children, knitting interesting yet educational toys for them to play with. But the fact is, you didnt get pregnant from an accident after too much booze, you both went in to IVF with the understanding that it may result in a baby. And the BFP surely puts completely different slant on everything, so reflections too soon on how having children wrecks your life should be placed quietly to one side, or at least toned down a hell of a lot.
In a teeny way, I can relate to how you are feeling, as all the rows and worry and anger that DH and I have gone through over the last four years regarding this baby issue has left a permanent mark on me, I will always look back and feel that no matter what happens, it is spoiled a bit. Tainted. No Hollywood memories for me at this point either, just very unpleasant, emotional and yet somehow clinical discussions. Urgh.
Anyway, back to you. The situation now is what it is, and it may take some time to work through it, but hopefully soon he will come to terms with what this really is - in my opinion, a miracle that you have achieved through trusting your heart over your head, and he is lucky to have you and that wee-soaked double line.
(PS: I wish I could tell you where I work, and see how close contact we have been, but internet paranoia holds me back)