CHECK UP

my doctor sheduled me a monthly check up, but its not the check up alone that i want to do monthly. i asked my doctor that i want to have a monthly ultrasound and if is it safe.. yes it is safe but asked me why i want to do my ultrasound monthly.. i answered her, its been 4years with my partner been wanting this, and i want to secure and monitor my baby's health, since i dont know if i loose it i might be able to wait for years to get pregnant again, besides my partner is already 63.. u may never know on his age. ?