What Causes Difficulty In Conceiving Even When Test Results Are Normal?

Dear Dr.chetna jain .I am 27 years old and 9 month started trying to conceive. My periods have always in 26-27 days. But i could not succed . I did all the blood tests pelvic ultrasound .And my husband did his semen analysis his sperm count is 19%5 and Motility Grade is 20%. I had an LH =2.58 and Fsh= 5.31. My gyneco prescribed me obimet -sr for 3 months and for my husband prescribed some vitamins and maxoza powder for 1 month . But still it could not succed after medicines.