H.B.
I tried for a while for my second child and did lots of reading on this topic.
1. What do you mean by "eat right"??? Do you eat right for a normal healthy adult woman? are you eating enough good fats, cutting out caffiene, etc. This is an interesting book (The Fertility Diet) http://www.health.harvard.edu/book_extras/the-fertility-d...
2) You have been trying for waaaay long enough to pay a visit to your doctor and ask what is going on, maybe you have a blocked fallopian tube or something. Rather than continue thinking about it and trying everything it might be medical.