Pen won't give me my last dose...

The needle is attached securely. The twisted but would not twist back properly. I eventually got it to twist and it moves back but doesn't push any of the liquid out. I'm gutted as this is my 4th dose. Is there anything I can do?

The needle is attached securely. The twisted but would not twist back properly. I eventually got it to twist and it moves back but doesn't push any of the liquid out. I'm gutted as this is my 4th dose. Is there anything I can do?