He only wants to try until Christmas as doesn't want to 'put his life on hold' or have too big an age gap between DS2 (4.1) and new baby. Trouble is I have a terrible cycle (anything from 3 weeks to 4 months - no pattern at all) and it is worse than usual after m/c last year.
I don't think he understands that since the m/c there is a baby-shaped gap in my life and that I don't care how long it takes.