Talk to Gynecologist on Problem In Pregnancy

Sir, I was married two years ago and have not had any children yet. In these two years, I have noticed that my wife does not ejaculate during intercourse. Have a good time having sex with me but my wife is tired during intercourse and in other words does not respond positively to me and after fifteen or twenty minutes I ejaculate Sir, I have analyzed my semen and my report is correct and I have also examined my wife from the lady doctor and she says that the reports are correct and the doctor has prescribed medicine to my wife and me. Another thing to mention is that my wife's period is not regular and her period is only one day. (Doctor Sahib Please check my and my wife's report and give me expert advice)