Luteal phase - AF arrived day 23!

Elana
So what do you do when you feel like you're doing everything right and still aren't conceiving? How do you start another month? 
My luteal phase has been a mere 10 days for the last 2 months, came off the pill in November, exercise daily, eat really well, take OPKs and have sex around the positive times. I really felt like this was the month. My body felt different but unfortunately not. So what now?  
Any advice would be great  ...