Cherries sometimes do have ghost pregnancies (unfertilised) but they breed so easily (give them a temp higher then 15C with a male and female and you are guaranteed to have a pregnant female) that it is hard to tell unless your watching when they hatch. Also virtually every fish loves some nice crunchy baby shrimp. Either it is a saddle or it just fed on some yellow food, the colouration of the shrimp appears a bit light to be heavily pregnant could just be a genetic defect though so again not a good indicator.