Cycle changes during TTC...

I've had a period since I was 10. I can't promise I was paying attention all the way back then but definitely since like 16. I'm 27 now. That's over 10 years of totally regular on time, the same every month boring cycles.

Since we became TTC I'm lucky to have two cycles the same! Wth!?

And it's not just me. I see tons of girls who post about changes to their cycle. What is it about being TTC that causes our cycle to change and our bodies to freak out?