To soon to drop fry?

[Ilovemyfishies]

On march 9th my mickey mouse platy dropped 18 fry. I'm estimating her due date to be April 6, as that would be four weeks, but she's already squared off and she has that white cone thing visible, and is pooping like crazy (which is what she did before she dropped the fry). do you think it's too soon to put her in the breeder? Is it possible that she can be ready to drop her fry before the full 4 weeks? Thanks