Fertility Boosting Supplements

So I and my husband have been ttc baby #3 for over a year now and its so frustrating. We conceived our baby # 1&2 within a yr. My periods are always on the dot. I have a 28 day cycle. Im 34 and my husband is 40. Has anyone taken any fertility boosters that has helped for both male and female? Im not sure what the problem is. Will be taking a appt soon with the dr.