If you have 5 chicks, the odds of at least one of them being a rooster is about 97%. You have 32 different possible combinations, including one where they are all roosters, but only 1 possible combination that gives all hens.
With only four hatching, those odds drop all the way down to about 94% (15 possible combinations out if 16) that you will get at least 1 rooster.
I once got 7 pullets and no roosters so the odds are not a guarantee, just the odds. But your odds look pretty good. Good luck!