When was the soonest after pre-lay shed?

Okay, so one of my het albino females had her pre-lay shed june 13.. Today is june 26, so its been about 13 days.. I went to check on her and shes balled up in the position they are usually in when they are laying eggs, and i moved her a bit, and her right above her vent looked to be a Ball! Which was an egg, in her, that looked like she was about to lay... Could this be possible that she lay so soon? The 30 day mark would been july13.. So when was the soonest after pre-lay shed that one of your females layed? Just out of curiosity...
~Brandon

so far 20 days is the earliest one of my girls has layed her eggs.

21 and 23 days for 2 of my females........one sluged out and the other gave me 6 good eggs...

i have had 6 clutchs this year and all 6 of them laid 28 days after shed