I've got a pair of endlers from the lfs about 3 weeks ago and I recently(as in just 4 days ago) shifted them into a 5 gallon tank with a few pieces of driftwood, some Java moss, a Java fern and 5 Malayan shrimps.The endler WAS NOT pregnant IT WAS DEAD!!!!!!!!!!!!!!!!!!!!!!!!!!!Just joking!As I was saying, it WAS NOT pregnant but I think it is now as it gone a little fatter but it dosent have a gravid spot.Both the male and the female are about 2 cm.So is it pregnant and when will it be giving birth???
Patience! You need to have lots of patience with Livebearers!
Endler's don't get incredibly fat, in my experience. Usually you can see the gravid spot getting darker though. It's slightly strange she isn't very pregnant by now, ususally they are impregnanted the minute they meet a male. Perhaps they are stressed. What are your latest water stats? Is it possible already had fry, and you didn't notice?