Go get checked out by a fertility doctor me and my husband were trying for years and as soon as we started eating healthier and working out I got pregnant
First step would be for him to find out if he has a normal sperm count or not. It may be as simple as him being to athletic, body temperature is to hot he may need to swim or take cool baths more or even his pants being to tight! If he comes back normal then you know something is off with you. Maybe an in balance of hormones and on. Testing him though is harmless, painless, and will give you both an idea on what your next step should be.