How can you tell how many days past ovulation?

Question

How can I tell exactly which day I ovulate on? How do I know dpo? The last green day on my calendar?
Tx

Answer

Yea, from the last green day on ur calendar. 
As a general rule its 14 days before ur nxt period (if u have a regular period). If u don't it's best to you use other signs like ur temp, physical changes, ov kits etc.
You can chart all ur changes on the app which is pretty good. U can set reminders to do these every day - I forget nearly everyday so I find it really helpful.