Um, being as my current cycle is every 39 days, I couldn't really vote.
I have PCOS and I have NEVER had a regular cycle every month, not from the very beginning. I used to have cycles that were about 2 months long and then I started going longer and longer and went a full year without a period when I was 21. Then I got the PCOS dx and went on BCP which gave me a "fake" 28-day cycle for a few years, then got off before TTC and watched my cycles go from 30 days to 39 over a few months and they stayed fairly stable at 39 days for quite a few cycles. Metformin gave me the short (Day 22 ovulation) cycle in which my DD was conceived, and I have had PPAF 2x, 39 days apart just like it was before. And my fertility signs show that this current cycle will be around 39 days as well. I need to get back on Metformin to shorten my cycles.
It's been the first week of the month for me and dd a few days behind lately, but I know it does shift because we don't have perfect 28 day cycles. I'm more aware of and comfortable with when it gets in sync with the moon; af tends to come when the moon is full.
dd and I have always been in sync with each other, even when she spent a year living 3,000 miles away.