It may take a month or two to regulate her periods with the BCP's. Give it another month and if it still isn't regular, she should talk with her doctor.
Hi,
thanks for query.
There is no reason for worry. These tablets are given for contraception or regulation of period. As long as she is taking it regularly there is very low chances of pregnancy. Normally with use of this drugs the menstrual cycle becomes regular and predictable. Continue drugs as per schedule and she will be fine.
Wishing you good health.