I have a few female swordtails and a male. I have two red wag females and a pineaplle mickymouse female. the pineaplle micky mouse is clearly pregnent, i can see the gravid spot. It is a pale oarange color and her stomach is not very plump. I have had it for about 2 and a half weeks or so atleast and hasnt changed much since then. I drew a picture because she is impossible to photograph, she is smart but not skidish. It is very close to scale. My red wag sword tails are most likely pregnant, i have had them for a month at least but i cant see a gravid spot, is that because of their color or are they not pregnant?