Oh, I'm sorry to hear that! All you can do is wait it out, I'm sure some others will chime in with their opinions. I'm no expert when it comes to sexing, I just don't think it's near red enough to be a cockerel. I got an OE from MPC a year and a half ago and I swore she was a he until she was...
Nothing is screaming cockerel, I'd wait awhile longer. MPC has a 100% sexing policy so if it is a cockerel they will refund you the price plus shipping. I'd say maybe a cream legbar mix.