Did i only save female fry?

[Kennakm]

My guppy had fry about a month ago. I’m trying to gender them and separate them but they all look so identical. I cant see a difference in anal fins or coloration i was in the hospital for a week and they didn’t get fed as much as they should. Could their development be stunted? Are they all female? Or am i bad at differentiating?

Help!

I’ve put them in a Pyrex to see them clearly and don’t want them in there for too long