Don't know where we are going wrong

We have been trying to conceive for four months. Taking prenatals, avoiding alcohol & coffee, using ovulation tests and making sure to bd at the right times yet still nothing. My husband and I are in our mid twenties both in good health with healthy lifestyles.

Starting to get frustrated that it won't happen for us and we are he type of people that talked about it lots and didn't make the decision to try until we are ready to have one that moment.

I feel like it's dividing us.

We want a child so bad.

What are we doing wrong....