When to test after Duphaston course.

Hi Doctor, I am trying to get pregnant. My last period date is on Nov 24th. This cycle i had letrozole for Ovulation induction. I have pcod. Dec 10th I have ovulated from left ovary confirmed by follicular study. We had contact on 2 days before ovulation, on the day of ovulation and after the day of ovulation. Also I was on Duphaston 10mg from Dec14th to Dec 23rd. Yesterday night i had ovary pain randomly on both side and back pain. Today i am having pain near belly button. When should i take pregnancy test since i was taking Duphaston till yesterday? No period yet. Also I have creamy yellow and sometimes white watery discharge. No itchness and no odor.  I have tested yesterday  and saw a faint line but don't  know whether it's  evaporation  line or because  of the medicine i am taking. Please help.