My advice it to take pictures of your birds, with combs and a good side views including the tail area, and then post them in the What Gender? forum, here: https://www.backyardchickens.com/forums/what-breed-or-gender-is-this.15/I've hand raised 4, 13 wk old chooks. 1 appears to be a cockerel. I can't keep roos. These four are very tight & always together, even free-ranging. If one is seperated, panic (& 'screaming') ensues. I don't know what's best for them. There's a no-kill farm of 200 chickens that will take my sweet cockerel. Won't he be lost? Is it better to keep them together? I'd have to give them all away (break my heart.) What's best for my extremely tight knit foursome? Thanks
You will most likely get good information on the birds, one way or the other. That way there won't be any uncertainty.
If it turns out you do have a cockerel, you will have to go from there. My two cents is that cockerels are tough and quickly adapt to new homes, and since you have a no-kill farm that will take him, you are luckier than most. People re-home cockerels all the time and in the vast majority of cases it works out fine.
Your pullets will miss him for a while, but they will quickly get over it. They don't need a cockerel and will do just fine on their own.