Becoming pregnant is one of the hardest and sometimes ironic processes to undertake.  Only (roughly) 9% of people become pregnant every time they try.  Even though this percentage is low, there are ways by using science to increase your chances of becoming pregnant and eventually going through childbirth.

Like everything in life, it is all based on timing.  Your ovulation is what gives you that edge to getting pregnant.  Trying to determine when you ovulate can be tricky, but ovulation charting and ovulation prediction kits (OPK) are your best tools to becoming pregnant.  It can take a month, or a year.  If it takes more than a year, however, I would go recommend seeing a doctor.  Age is also a factor.  I hate to break it to you, but the older you get, the harder it is to get pregnant as well as the more likely your child will have some sort of retracted growth (mental development, physical development).