Any Suggestions?

Teri 🌈✨
My husband and I have been trying to conceive since April 2016 and nothing. Period comes like clockwork every month. I'm taking prenatals and vitamin D3 1000 as recommended by my doctor, who I've seen twice regarding pregnancy questions and planning and he isn't concerned with my situation. Is there anything else we could be doing that might help out a little? We used preseed for two cycles and we loved it but obviously it didn't give us the end results we were hoping for. 
Just looking for suggestions :)