Hello Don t blame yourself for this Conception depends on number of factors like Sex near the time of ovulation patency of fallopian tubes and release of ovum I have seen number of patients in my clinic and I would advise them for battery of tests like semen analysis for you and ovulation study as well as HSG for your wife. As far premature ejaculation is concerned you can very easily overcome this.problem with behavioural therapy and medicines are also available for it. Please write back to me with a the relevant information and complete medical history so that I will be able to guide you more accurately Best wishes