Well I want more than 1 child but I'm not sure I'm willing to go through 2 pregnancies. We're are considering adoption. But don't want to do Ivf
I am sorry for your loss, that must have been unbearable.
You could do IVF and insist they put in three embryos, that might give you a better chance of two sticking. Otherwise there really isn't any way to increase your odds of twins. It might not be for the worst, though, to have a singleton, because that is a safer pregnancy than a twin pregnancy is.