Just wait & you'll have some great stories to tell! My orp did the same thing. Then she learned that I removed the poo when I made my daily check. She learned to hold it until she saw me, then BOOM! Time of day never even mattered. It was my presence that caused the reaction. My family is still laughing about it. (How I "potty trained" the hen. or how I bring out "the best" in our pets or even all the remarks about the broody's special presents made with love... or sh**.) I think you get the idea. Gross and amusing at the same time. In the long run all but one egg hatched & that one was a clear. The dirty little eggs hatched just fine.
She was cranky tonight when I checked her eggs, lol! But she is all snuggled in on them and apparently the plastic has put her 'sisters' completely off sleeping on her crate, which is good. She now has five guinea eggs, but she's getting all twelve when we get closer to hatch. She also has three eggs from my hen Lemon, who I just wanted some chicks from because she's a good hen. One is huge and if it's not a double yolker I'll be surprised. That one is probably coming inside to the incubator to be hatched if it makes it all the way. And after candling, those eggs are fertile too, which I did not expect! My ayam cemani rooster, Raptor, mated with her exactly one time and apparently hit the mark.