I don't think its being disrespectful to Isabel. Your never going to stop loving her or replace her. I agree that the worry will not go away with your future pregnancies regardless of the time between then. The right time is when it happens weather its tomorrow or next year. Provided you have had your postnatal check and all is how it should be down below then I am sure you are physically ok to ttc. There is a forum on here for women ttc after stillbirth. I am sure you will get some great advise and support from the women who have had similar experiences to you.