Yesterday, I moved my 3 pregnant guppies to my nursery tank. They are pretty big, but still no little eyes in their gravid spots. This morning, I woke up to find 1 little fry in my community tank, and don't know who birthed it. I do have 1 pregnant swordtail in there who has had a dark gravid spot for about 2 months, but again, no little eyes...I am baffled as to where this fry came from. Do you ALWAYS see eyes before the mother gives birth?