Well, based on your question, I'm not sure if you are hypothyroid or not. I am and a low TSH is a good thing because it means that your thyroid has enough hormone. I have read that a TSH of about 1.0 is supposed to be the ideal for getting pregnant, however I have also read of others, and I know in my case, that I feel best with a TSH of about 0 - 0.5. This is where I was when I got pregnant. If you have a normal T3 and T4 that's good for getting pregnant but I'm not sure what you mean by normal. There is a range and some people feel better at one end, while others might do better at the other, so you have to find out what is optimal for you. Normal and optimal are not the same thing. Also, how do you know you don't have another problem? Uterine polyps or fibroids can be very small and practically symptom free while preventing pregnancy for example. Also, perhaps your husband/partner has a sperm issue, he should be tested. Even if he didn't have a problem in the past, it could have recently developed. Happens all the time. If you are having trouble conceiving you should speak to your doctor.