Denying me my persciption...?

Nic
My mom went to pick up my persciption of nuva ring and they told her I wasn't due for it yet but I put it in on the 3rd and did my three weeks in and one week out and tomorrow I should put it back in but they wouldn't give it to her. What can I do? I was hoping to go down to the pharmacy tomorrow morning before work but what is the chance they will give it to me? I think they are messed up because December has 5 weeks.