According to the Nuvaring "3 weeks in, 1 week out", it seems like the insertion date on the calendar always seems to slip back a few days... that accumulates, and eventually the insertion date is no where near one's period.
My girlfriend first put it in on Oct 24...
Based on that, insertion dates are as follows:
As you can see, the day always slips back a bit every month. Is that correct?????
If her period is always close to the 24 th it is irregular as the number of days between differs every cycle. Regularity means the same number of days between the start of her period every cycle, regardless of the calender date. Hormonal birth control will force her cycle into the 21 days off, 7 days on cycle every time. That is how birth control works. This may take a while but ultately that is what will happen.
The 7 days bleeding is also not menstruation but bleeding because the hormones are withdrawn. There is no/very little uterus lining to shed when she is on birth control.