2 Day Period

Hi there! 
I'm asking this question in hopes that someone out there may have a clue as to what might be happening. I got off birth control 5-6 months ago and have been TTC and ever since I've been off, my periods have been about 34 days apart each cycle. This last period came on Day 38 and it was spotting then more bleeding the next day and it was over. I've been having headaches and my back was aching early this morning. Has anyone else experienced something like that?!
Thanks!