confused !?

Briana
I'm not understanding well. I haven't tried any ovulation tests yet. But I have been logging my periods and cv fluid for almost 2 years now. How do I know how many DPO I am ? My cycle length is average 30 days and my AF is due 1/30! My periods only last 4-5 days .. I'm TTC my second child. It's been over a year and I've had 5 chemical pregnancies..