My husband and I had trouble getting pregnant the first time. We tried as soon as we got married. But we built our house right after getting married, very stressful. Then after moving in and trying to get caught up on bills, I was working overtime at my full time job plus a part time job. Again very stressful, not much time for my husband and I.
So I quit my part time job, and overtime was less at my full time job. One month after quitting my part time job, I was pregnant.
My point is, stress does a lot of damage to our bodies. If you are very focused on getting pregnant (and it sounds like you are frustrated as well), that may be the big reason why you aren't pregnant.
Question, how is your diet? Are you eating well? You know fresh fruits and veggies, protein, etc? It is good that you are taking prenatal vitamins as you are conscientious about supplementing your diet. Word of caution...don't rely just on the vitamins to help your body. A good diet, exercise and clean water will help as well. Also, here is a test to ensure the prenatals are getting good nutrients into your body. Take a cup of room temperature water. Put the prenatal into the water. If if doens' dissolve in 30 minutes or less, it is going in your mouth and coming out the other end the same way. Not a pleasant thought I know, but this is a test that professionals use to determine if a prescription is getting into the body.
Now to help you relax (and your husband), what about a weekend away. Just the two of you.
Many blessings,
M.