Hello;
welcome to HealthcareMagic
Normally to postpone the periods when you have to take tablets they are supposed to be started at least 7 days before the expected date of periods.Now since it is 25th day of your cycle and if you have a cycle of 28-30 days then in that case
Novelon will help or not it is difficult to say.If you want you can try but will it work or no it is difficult to say.
Thanks