I wasn't charting but I was keeping track of my periods, and when we DTD each month.
My average cycle was 27.5 days but some were 26 and some were 29 and one was 31 (I was supposed to have it for my wedding but it held off until the next day... which really messed me up and I didn't drink thinking I was preggers!) it really was all over the map.
But my last period started Oct 10 giving me a EDD of July 15. The midwives are going off of July 17th and I'm positive I FELT conceival on october 22 which would be cycle day 13?
So yeah sometime next week
I've always felt Monday the 14th would be either the day I go into labour or have the baby (based on my feelings of how my last birth would have naturally progressed) But DH has a ball game that day and a couple friends are out of town so I'm really hoping to make it until the 16th