I feel similarly to you lexy, in that dc3 'should' be the last for lots of good reasons but i wish I felt more certain and confident in that decision. Even though I have struggled to get pregnant each time, had lots of mcs, found pregnancy so hard & I now have pnd (dc3 is 11mths) I am still slightly yearning for another baby, or at least don't feel ready to say 'no more'.
Both dh and I feel the same in that we agree it would be too difficult, we can't afford it, house not big enough, looking after the 3 we have whilst pg (dd has high care needs due to a serious medical condition) is too difficult, we are too old, would make holidays almost impossible etc
And yet there is a bigger gap between dc2 and dc3 than we wanted (due to multiple mcs), so another sibling for dc3 would be good i think. 2 plus 2 with a gap in between. we always talked of 4, dh is one of 4, me one of 7, And the thought of another baby and another member of the family just feels really positive.
I think I just need to accept that thre will be no more, but I just wish I felt more comfortable with that and less of a yearning mixed with sadness.
I know we are extremely fortunate to have the 3 we do. It has been a long road of infertility & serious illness for dd so they are very precious.
Perhaps I just need to make my peace with the decision that dc3 is the last.