I went through this , do we , don't we a few months ago myself.
I ave 2 DS's, one is 5.5 and the other is 15 months old.
I too have ALWAYS wanted 3, and honestly I won't lie about the fact I never imagined myself as a mum to 2 boys only!
DH agreed initially even though he is REALLy not keen, but month after month of trying....we only tried 3 months, then I GOT COLD FEET! I am a VERY PRACTICAL person and realised that we are struggling to pay childcare as it is with only 2 and we could not afford for me to give up work.
So, we made the decision to stop trying.
I have started selling off some of the baby stuff and trying to use this as a bit of therapy in seeing if I can accept no more babies.
It is hard, every single womanly part of me yearns for another baby and I physically ache when I see a pregnant woman. Feel really sad that I may never be pregnant again.
It is a really hard decision when you have to be grown up about it and think with your head and not your heart.
Good Luck in finding the answer.