Identifying CD1

So looks like I had an anovulatory cycle this time. My bbt never increased significantly even though I had a positive opk. I started spotting around the time my period was expected. It was just spotting and not the regular flow. Now how do I determine my CD1 for the next cycle? Would it be the day I started spotting? Or should I not consider my current cycle to be over until I get a full fledged period next month? Do you think I will ovulate before that?