I would call it "maybe male" and wait a while longer.
I've seen a number of posts in the past with chicks that had big combs for their age, and some of them did turn out to be female.
If you are impatient for an answer, you could consider DNA sex testing:
https://orders.iqbirdtesting.com/order-bird-dna-test/
You send off a sample (a few plucked feathers or a few drops of blood-- they give instructions both ways), and the lab analyzes the DNA and lets you know which gender the bird is. Their website is currently estimating "2-4 working days" from the time they receive the sample. You get the results online, so no wait for the Post Office to get it back to you.
In most cases, it's easier to just wait for the chick to get older, and the test would cost more than the food the chick eats while it's growing, but sometimes it is worth the money to have definite results sooner.