chook newbie help needed plz

hi im fairly new to keeping hens ive got 2 light sussex 1 cucko maran and 3 warrens my little light has gone broody so i decided to get some fertile eggs (with some encouragement from my kids) they are on day 5 under her but on day 3 i went in to feed her an she had pooped on the eggs stinky is an understatement so i used a paper towel to just take the clumps off there still slightly dirty as its wet an muddy just wondered if ive done something wrong and if there is still a chance they will hatch thank you very much

you need to lift her off the eggs at least once a day - I lift mine off twice a day. This allows her to pooh, stretch her legs and eat and drink. I trust she is in a separate broody coop - if not she needs to be so that when the eggs hatch the other hens won't attack them.
Do not put the food and water in the coop or she will never come out 

Hatching little chicks is great for the kids to see, but have you given any thought to what you will do with the cockerels that hatch? Depending on what breed they are you probably won't know for sure until they start crowing, and by then you and the kids will have become very attached to them.
The eggs will be fine.

i went for cream legbar so i should be able to sex them......i will eat the males and keep the hens for eggs