Wow! I guess you must collect your eggs quickly & never leave them outside or they'll incubate on their own!
I'm lucky enough to be at home more often than not, and yeah...I collect eggs multiple times per day at this time of year.
When I allowed that persistent broody, Lily, to hatch into early summer last year, she finally got to the point of leaving the eggs for over 15 minutes once the ambient temperature got so high that it reached "incubation level". When she returned to the nest she sort of hovered above the eggs, standing so her body was about 2 inches above them, with her wings held out and while she panted heavily. It was tragic to observe. Luckily by that time she was very close to the end of the hatch and her nesting box was large enough for me to keep fresh water right next to her to keep her from dehydrating.