Can I add chicken eggs?

[KikiDeAnime]

I just put duck eggs in yesterday so we're on day 2 of incubation. I was wondering if I could add chicken eggs on Saturday, 1 week after setting duck eggs???
Or would that mess up the incubator??

 

[BirdsBeesTrees]

If you could warm up the eggs a bit before you put them into the incubator it would be best. I think the duck eggs could probably handle the temp spike short term. I would do it.