2 eggs from one girl...is everything alright?

This morning I let the girls out and collected the early egg from Lara Croft (speckled). 

When I cam home from work there was one from Jane Russell (black rock) and one from Marilyn Monroe (light sussex)  AND yet another from an unknown vent: I only have 3!  The extra egg was intact but had a very soft shell.

Is everything alright with the girls? should I be concerned?  Can I eat the soft egg (scrambled)?

So many questions, so little time! Thanks in advance.

SJx 

They have been laying again now for about 4 weeks but we've had a few blips - double yokers - not laying for a day - no shell egg or two.

I'll give them a bit longer to get into the swing of things!

Thanks for the help.

SJx