I cannot give you exact answers to your questions
without knowing more of your medical
history and doing some lab tests, but in general infertility can be due to a female factor, male factor, or both.
Are you aware of when you are ovulating, and do you make sure to have intercourse during those days of the month? A great tool is this free MedHelp Ovulation Tracker (https://itunes.apple.com/us/app/my-cycles-period-ovulation/id335875911?mt=8).