​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​this is last month. Where does DPO begin? the very last day or the day you were most fertile? sorry fist month using this app.