Period 6 days before due.

I have a very routine cycle. We started TTC in December, and my cycles always exactly 36 days. (long, I know). Well I started tonight (I usually always start first thing in the morning, so weird) and it's not due till next Sunday. (The 21st) 
How weird is this? I cried and cried to my hubby cus I was for sure this time i was pregnant due to all my emotions and tender breasts, etc. now I feel like a fool because it was probably just pms symptoms and not pregnancy symptoms. Just happened early this month. Any insight? I have a tinge of hope that it could be just spotting. But then I don't want to feel like a fool again...