Most of us guys have been around women all our lives. Although my wife is post-menopausal (and now uterus-free) I have two daughters. Some of us pick up on things.Haha I think it's very funny that the community of vapers are all answering my embarrassing question, men and all xD
Some women can and do go through periods (no pun) where their menses get out of whack. I had one female friend whose period had been calendar-regular and then drifted from 27 to 35 days with occasional skips as she neared 30. The first woman I cohabited with was on a dead-solid 29 day schedule. My wife's floated on a 27-32 day schedule. Point being, everybody is different. If you have questions about what may be going on, by all means see your OB/GYN. There's a fair chance that what you're "afflicted" with has some level of normalcy and shouldn't be overly concerning.