Married and TTC. Tips?

Hello, everyone! My husband and I are ready to have a baby, and have been trying for over six months with no luck. I'm worried that something could be affecting fertility. I am 5'2 and only 100 lbs and I'm afraid that could affect it, but my doctor has told me before that there's nothing wrong with my weight, I simply have a very high metabolism. If that's not affecting my fertility, could something else be? Does anyone have tips/advice for concieving and boosting fertility?