I am trying to get pregnant but not happening we did thyroid checking and it found to be normal. Then did follicular study and it's found to be 19 mm ,24 mm and 24 mm on 10 ,12 and 14 th day respectively and on 14th day endometrial thickness is 8 mm. Semen analysis also showing normal result. And I took duphaston from 05.01 to 14 .01.17 and on 17.01 brown spotting as well as very light flow occurring .actually my regular period expected to be happening in tha same day itself. But actually 1st day itself I have good flow and continue up to 5th days. Then what is the reason for brown spotting. And I did unprotected sex from 28.12 to 4.01.