What Causes Inability To Conceive Despite Taking Dubagest?

hello doctor i am 27 years old got married before 1 and half year, from last six month i am trying to conceive but unable to do... i already consult to a gynacologist and he investigate my egg formation at the 13th day of my menses cycle through sonography....that is also okie she prescribed me dubagest sr 400 tablet...but till now no response kindly nhelp me