Brahma Babies

Got two Brahma chicks last week - breeder said they were both around 5 weeks old and she believed they are both hens. The Isabella was a bit larger than the lemon upon purchase so I assumed she’s a bit older. Have had them a week now and the Isabella is considerably more feathered and is getting redder in the face. I know it’s early, but can any chicken guru tell me if it might be a rooster? We only have 1 other chick (hopefully a hen) and are zoned for no roosters. So if this might be a Roo I’ll consider picking up another chick In hopes that at least 2 out of 4 are hens. I don’t want to end up with 1 lonely girl!