Hi,
So my periods were very regular and 'normal length' up until a few years ago when I had the HPV vaccination, although the timing could be a coincidence. For about 4 months after the vaccination I had no periods and up until a year ago they were irregular and sometimes skipped a month. Since last year they have been roughly the same length, 40-42 days but this appears to be outside the normal cycle length. I have no other symptoms, and experienced PMS and cramps etc. as usual, and when the period does come it's completely normal. Should I be concerned or could I just have a longer cycle than average without there being a cause?