Duphaston or pregnancy symptoms.

Today is day 15 post ovulations as per my follicular study. Today is also last day to take duphaston. For first 10 days post ovulation, I did not get any symptoms. But for last 5 days I am getting headache, lower abdominal pain which going away in sometime and again coming, pain as like something is getting stretched in my stomach, getting tired, twice I felt like bad smell is coming. I am confused that these are symptoms of pregnancy or duphaston. I don't want to test now as I will test after 4 to 5 days. Please suggest what are these symptoms. I know most of you will say to do upt to get confirmation. I am trying since last 5 months, so bit stress and don't want to test now. Help me knowing what are these symptoms as per your experience.