I would also say not stress, my 2010 diary is a very anal log of when we had sex, ovulated, period length, mucus, cervix position.
We fell pregnant the same time I said to my husband "This isn't working, been over a year and nothing. Maybe we should take a break for a while from this, we obviously require more intevention that just lots of sex"
He said to try and relax. I was wired tight.
Then one morning I got up and couldnt even make my coffee it was making me feel sick just looking at it, and I like my coffee. I love it. I have an expresso machine and milk foamer.
So did a test and it was there.
I honestly think we conceived the night we were watching TV and had a wee go on the couch.
I know though the advice of "relax" is a hard one to take in when its something you want so much.
My doctor also told me to just keep trying and try to lose weight to help my PCOS and a healthy weight leads to less complications in pregnancy.
So just keep doing what you're doing. Remember your folic acid!