My dr told me to take mucinex, it thins all mucus, if you know what I mean, it worked for me!
I am sure you know too, that stress doesn't help - I find some things that you really want, happen after you say "bugger this, I don't want it any more!" In other words, try to relax a little.
I took my tempreture every day, and timed intercourse with that - I bought a basal thermometer from walmart.
It was hard for me to conceive because I have PCOS, and I am sure that in 4 years you have been to the doc to find out if anything is wrong.
If you have PCOS then a low carb diet will help.
My son is 6.5 years older than my daughter, it took us a while!