Now, this may sound bizarre, but I have known at least 3 couples in my lifetime who had the same difficulty in conceiving ( some with medical problems and some without) that were able to have a child after they gave up trying so hard and just became happy with each other.
Ex.
1st couple: no medical problems but couldn't seem to get pregnant after 10 years of trying...after that they determined it wasn't meant to be. Adopted a child, and a year later the adopted child got an unplanned sibling! Relaxing and not having the pressure of counting best fertility times..etc. helped.
2nd couple: thyroid had to be taken completely out for cancer and had to take hormones...told she would never have a child. Also, she was obese and lost about 60 pounds. She now has a cute 2 year old girl.
3rd couple: had cervical cancer and had to have cervix completely take out. Told she would never have a child. Had 8 miscarriages. Given up and said she must have dogs as her adopted kids. 4 months later...she got pregnant, had a high risk pregnancy but carried to full term. She now has a healthy 4 year old girl.
So give up...but not entirely? Relaxing, making things fun and not freaking out worrying if it happens or not seems to be the key