My chicken eggs are at day 17 and the embryos are still small wat do I do
How small? Are you sure they are still alive? Day 17, the egg should be almost entirely dark. Little clear-ish area next to the air cell, and a little maybe in the pointed end.
Sorry I'm not sure I can offer any advice as I only hatch ducklings. This question might be better suited for the chicken forum, though maybe someone here can help.
Basic principle is still about the same, only they take 3/4 as long as ducks

How hard is it to hatch ducklings?
Not that difficult. Have you hatched chickens?