swordtail pregnant

Question
my swordtail has give birth 8 day ago. But she has dark spot in her belly again and is getting bigger is she still pregnant and what do i do  

Answer
Swordtails, and other livebearers such as platys, mollies, and guppies are mostly always pregnant.  One injection from one male is enough for a livebearer to have three more pregnancies.  Just let her be, and she will have her fry again in about 15 days.
Lynda