I don't know if you have tried any of these but drastic or even simple changes to diet will increase the quality and quantity of fertile-type mucous (not all mucous is the same--ideally, you want to have clear egg-white type mucous that can be picked off a piece of tissue paper and will stretch up to 1 inch--you should have increasingly fertile-type mucous for about 5-8 days to have a good chance at conception. Thick, white, yellow, tacky and sticky mucous are not condusive for sperm to swim through even if you're producing a lot.)
These are things to try
-Drink a lot more water
-Stop consuming caffeine (no coffee, cola, tea or chocolate)
-Do not take antihistamines
-Take evening primrose oil (alternatively take flax seed oil)
-Drink grapefruit juice (there haven't been studies that correlate this but thousands of women have found it helpful--I personally, have used grapefruit seed extract diluted in water--it's very bitter--but it made me produce an incredible amount of fertile-type mucous. I was honestly REALLY surprised! This can be bought at a health food store or possibly in the Wellbeing section of food markets like 360)
-Get more exercise into your day--breaking a sweat helps the circulation in your body (blood, lymph) which also affects the discharges in your body.
-Make sure you have an extra healthy diet--protein, fiber and grains, vegetables, fruits, dairy--all are important
-Vitamin intake. Most people do not get enough of the nutrients that they need every day. Personally, I swear by a vitamin supplement by Garden of Life called Omega Code Women. It has Cofactor Q10 which has been shown to be especially good for the female reproductive system. Taking this vitamin (which is raw and easily digested) honestly changed my reproductive health. I had tried others before but nothing produced results as clearly and quickly for me.
Good luck!