Any one having "shrinking"cycles?

Alicia • Mommy of 4 boys..22, 19, 16, 14, and my sweet 4 year old daughter. EP 11/13, CP 03/16 PREGNANT WITH #6 ❤️❤️❤️❤️❤️❤️
I'm on cd24 and AF just showed..last month was cd26, month before was cd28. I've become used to 28 day cycles over the years..this is just going crazy. I'm going to call my ob tomorrow but, I'm curious of this has happened to anyone else??!!