Hi, firstly can I say my sister and her ex were together 7 years and never took any precautions. After the broke up she got pregnant within months, and his new partner did, so it just shows you that sometimes its just not meant to be, some people aren't compatible. So don't lose hope. Plus there is nothing the medical people can do anyway until you have been trying for one year with your new partner.
Don't know if you already do this, but do you keep a diary of your cycles? And do you know about ovulation etc.etc.
Probably silly qustion cos you might but you usually ovulate 14 days before the first day you come on thats if you have a normal 28 day cycle. Ebay sell ovulation kits which you take from around day 10 until you get a positive ovulation test. The best time to ttc is from around day 10 to day 15-16 as you can't get pregnant after you've ovulated. Theres a few things you can do to increase conceiving have a look on this site and others. x