I have had this fish for 18 days and it has always had its gonopodium and a gravid spot...Demeter said:It is possible to have “sneaker males” who are just young males that appear female. This is often true for particularly large livebearer males, they’ll look like big females then suddenly they develop the gonopodium. I’ve had it happen with swordtails.
I’ve heard of them “changing genders” but until I actually see a female (which has given birth) turn into a reproductive male then I say it’s a myth.
So just remember, all fish when young will appear female until they start developing their male characteristics.