I am so sorry to read of your loss, I know how devastating it is.
I don't think it would be just a one off lucky pregnancy...I can't say how long it will take now, because you just never really know, but I really hope it's not too long for you before you are pregnant again. I tend to be realistic/pessimistic too. It's self protection a lot of the time.
DH used to be really positive, but even he tends to be a lot more cautious now. sending you all the best.