There really is no way to know unless you actually witnessed it. Some signs would be extreme damage to the female, cloudy water, and all the sudden a decrease in aggression.
She has a bigger rear end than Micki Manaj lol. What temperature are you keeping her. Do you think a higher temperature will result in an earlier birth?
I think things are different today vs. a few years ago. Due to selective breeding, physical characteristics that people looked for are now gone. Before a dead give away of a higher grade fish would be 3 rows of spots around the perimeter. Now, it's all about the size of the spots and how...