I am glad to have found this thread, and will have to go back and read some more, but I wanted to go ahead and post.
My cycle has never been super regular, but after I entered my 30s (34 now) it became more consistent although more intense. Cramps, sometimes severe, for the first two days, heavy bleeding the entire time, but lasting exactly 7 days (in the past I could have a very light period but go for 14 days).
When I started W30 I was already two days late (I track with an app, and it's become fairly accurate now that I've used it long term). Well that turned into