Up until I hit my 30's, my cycles were always, always 28 days. Once I hit my 30's, they started getting shorter and more sporadic, lasting anywhere from 24-28 days with an overall average of 26 days. Something prompted me to google why and I stumbled upon this fascinating info: http://natural-fertility-info.com/early-ovulation-and-fertility.html
Thought I'd share in case anyone is in a similar boat as it also includes good info about what can be done to help lengthen the follicular phase.
Also, I thought this was cute: I asked DH to pick up a pregnancy test while he's at the store. He said- "OK, I'll probably grab a jumbo pack so we have 'em."