I'm new and cant understand why this keeps saying my next period is due Jan 21st when my last 1 was Dec 16th and should have been due yesterday. I've tried changing it and I cant. How do I change it?? I put my CD were 28 days long.

Hazel😍 β€’ Mother Of 2 Princesses πŸ‘‘πŸ‘‘ 4 Angel Babies πŸ‘ΆπŸ½πŸ‘ΆπŸ½πŸ‘ΆπŸ½πŸ‘ΆπŸ½