4 Little Angels With My Last Name

over the last 4 years we have had 4 miscarriages, the last being in Sept. They have done every test under the sun and have no answers. I can get pregnant every day of the week, for some reason I just cant stay that wat. I know I can do it, as I have a 13 year old and a 6 year old. This last baby really tore me up emotionally, and it took a couple of months for me to pull it together.
My family thinks im crazy to want to try again, but its become like an obsession that I cant stop. Just wondering if anyone with a similar story has been successful carrying to term?