TTC close to 40

Maritza • 38 year old mother of 17 year old twins. TTC although some think I`m crazy to want to start over!!
I'm 38 and have twin 17 year olds. Some think I'm crazy to start over but my fiance doesn't have kids and I always wanted another child. I stress about getting pregnant at my age. We've been trying for roughly a year (no meds or anything though).