i have a female swordtail that appeared to be preg. as you could see that she had swollen up and had the black spot near the rear. she has since lost her swollen body and now is always at top of the tank near the filter. today i saw her and observed bubbles to come out of her anus area. is she about to give birth and the black spots are still present. i put her in a breeding net just in case. anyone with more info please help!