Oh Blessedatlast - I am so truly sorry to hear about your precious twins.

I don't have any experience with the classical cut but as Salsa says, I understand the advice is usually to wait at least 12 months before TTC (although many women do have successful pregnancies and births with shorter intervals). I think the advice re the 2 yrs refers to the birth interval - ie having at least 2 years between the births - which you would achieve if you concieved 15 months after - so possibly there is not that much difference in the advice.

Look after yourself and be extra kind for the next 12 months - get really healthy and being in the best shape possible before TTC will give you the best chance.

I truly wish you all the best,
TICKLISH