I know people who have had experiences like yours. However, this is my 8th baby, and I've had 8-10 months without cycles when I've consistently nursed the others. Of course, at my age, I could always have a surprise hormone change :-).
Oh well, I've got 4 wonderful kids, and have enjoyed having them all home for the last two weeks. The oldest left yesterday to go back for his final year in law school, and #2 son will head back to grad school in Texas next week. The week after that #4 starts his soph. year in high school, and the following week, #3, who is homeschooled, begins her Senior year with 2 classes at the local Community college.
And so the school year begins...