Help :(

We have been married for 3 years in October. We have been trying for a baby about 4 years total. We have tried everything in SuperDrugs to help us. My doctor has done the blood tests that have came back normal. My husband has had a semen test done which has came back normal,( my husband also has 3 children.) my periods are regular and have always been spot on each week. I follow another app called "ovia" which is more accurate on my periods and ovulation day, I ovulate spot on each month aswell, although when I do ovulate I get really bad stomach cramps (could this be a problem or is that normal?) I had keyhole surgery done 3 years ago to remove cysts from my ovaries but when discharged from the hospital my notes state I shouldn't have any infirtility problems. We have now been referred to a fertility clinic to see what the next steps are for me and my husband. Does anyone have any advise? Or any tips for us?