I have been TTC for 4 years and I am very happy to say that I am almost 8 weeks pregnant!
I wanted to let you know what I think made a huge difference.
I have used a product call Preseed.
It is a lubricant (and doesn't claim to be a fertility aid). Unlike most lubricants it doesn't contain spermacide.
It is supposed to emulate healthy, fertile mucus to help conception.
I don't think I had a great deal of mucus so this definitely helped.
I got pregnant on the second cycle using this (however, the first I think I got my dates wrong and had sex after I ovulated).
I would highly recommend giving this a go!!
Good luck ladies.