It's not uncommon for women to try for more than 9-12 months to become pregnant. I know that you've been trying since September, but that isn't yet long enough to be blaming a medical problem. It's most likely that you just aren't having sex at the right times; a fertile egg is only able to be fertilized for a few days, and if you miss that time, you won't become pregnant. The challenging part is identifying when you're most fertile.

If you're really serious about becoming pregnant, I suggest looking into the Fertility Awareness Method which can help you determine when you're most fertile. It's relatively free to do, and you should be able to find a book about it in your library. There are some sites online devoted to this topic, but they tend to be brief. All you need is a few minutes everyday to observe your temperature and/or cervical mucus or cervical position and chart that information. It doesn't take long to see a pattern and be able to apply the information.