Why is my pregnant fishes mouth open?

my pregnant ballon bellied fishes mouth is like REALLY open and shes not shutting it? wats up? it wasnt like that before and i got home and now it is? oo and shes bumping into stuff alot. now shes in a breeder thing( shes been in it for like 4 days) and she eats the food but spits it back out. since her mouth has been open i have tried to feed her once more but now she doesnt even go for it. is something wrong? ps is it usual i think i can see the fry inside her stomach.. wat does that mean?
thanks
 
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