Here's what worked for me: ( I got pregnant at 41)
Try robitussin/mucinex/guaefenisen for good cm (cervical mucous)
Here's how it i did it:
Just make sure its only the expectorant kind. and that the only active ingredient is guaifenesin. I got generic guaifenesin tablets at Target.
I took two pills orally 2X each day starting when the ovulation predictor test strips said i was ovulating.
Also, the first day OPK indicated ovulation, we had sex.
Then, i put in a menstrual cup (to keep the spermies in place for a while since i had to get up and go to work)
Took 2 guaifenesin tablets.
Then, after i got home from work, i mushed spermies against cervix again for good measure before going to sleep (then i removed the cup from inside)
Then i skipped one day but took 2 tablets that day also.
and then i did same thing the day after that (sex and menstrual cup with guaifenesin oral tablets)
Results?
The first time i tried doing this it i got pregnant!!!!
(8 months didn't work trying other things besides guaifenesin)
But truly, i think the guaifenesin is what worked. (also called mucinex, expectorant) Can't hurt to try anyways. I read about it in "Taking control of your fertility" and figured it was worth a shot...
Good luck. (BTW, what i did besides the guaifenesin the month i got pregnant, is i kept doing everything else the same, ie coffee, alcohol, exercise, etc. When i changed anything thinking it was beneficial for getting healthy pregnancy, my body got freaked out and i became late ovulating and stressed... so i tried keeping everything normal, 1 coffee in morning as usual, and 1 alcoholic beverage at night ( only to stay de-stressed and it worked!!!) first month i did this i got pregnant,but every other month i tried (8 months trying before) i had tried staying off coffee and had zero alchohol and i got soooo stressed that i think it kept me from getting pregnant...just my humble opinion, but maybe worth a shot)