I agree - no reason to believe you'll be infertile. I suspect a bigger factor than length of time on birth control is age - people who have been on birth control for a long time are more likely to be at an age where they aren't quite as fertile as they were (or would have been, if not for birth control) a decade previous.

However, paleo can help address some common causes of infertility, and I think most people here would be in support of going paleo regardless, as long as you're paying attention to your personal nutritional needs - eg. if you're at a healthy weight and TTC, you probably don't want to be doing low-carb. On the other hand, if you're suffering from PCOS, low carb might help with fertility. In any case, you want to be sure you're eating a good variety of foods and getting a good dose of healthy fats and adequate protein. Also, you may want to supplement folic acid, or at least be sure you're eating plenty of green leafy vegetables, eggs, and liver. Many processed grain-based products are supplemented with folic acid, so if you're cutting those out, you want to be sure to replace them with a natural source or a supplement.

Also, get a copy of Taking Charge of Your Fertility by Toni Weschler. It's invaluable for getting an idea of what's going on in your body, fertility-wise.