Hi Kelly,
You've received a lot of insight, here's some more from someone who had a very difficult time conceiving AND has a thyroid issue. FIRST, many doctors (including fertility specialists and some endocronolgists) will tell you that your thyroid has nothing to do with your ovulation and/or conceiving. BUT (this is a HUGE BUT) it does. After several years and much research, I can assure it does. You must have your thyroid under control before you'll properly ovulate, since your thyroid affects your pituitary gland, which in turn affects every other part of your body, including hormones and ovulation. Synthroid did not work well for me, since my body did not convert the T4 into T3 properly, so I went on the natural Thyroid, Armour thyroid. That helped significantly with my thyroid balance and my sense of well-being. My endocronologist, who worked closely with me during my IVF procedures, is excellent and sees this same issue with many of his patients (many doctors don't understand this issue because there is little or no large "clinical" studies that account for thyroid as a factor in ovulation and/or pregnancy. So it takes a skilled endocronologist to catch it).
SECOND: You must have at least 14- 16 days between your period and ovulation for pregnancy. These are crucial numbers that few women know (though you will learn in the recommended book). I cannot explain why (the book or your fertility specialist may), so 16 days is actually a GOOD sign.
THIRD: cut out all caffiene and pay attention to your sugar and carb intake. For thyroid patients this seems to have an impact (again, we don't know why, but it does - again few doctors tell you this). It's important that you have a BALANCED diet, so that includes sugars and carbs, but be sure they're the right ones in the proper balance.
I also read the book "Taking Charge of your Fertility", which is an excellent book and I highly recommend. There are other books too at Borders or Barnes and Noble.
I am very grateful I have an endocronologist that is so knowledgeable, especially about the thyroid's impact on pregancy. It is critical. If your endocronologist thinks the thyroid has no impact on fertility or pregnancy, that's a sign to find another endocronologist. Once my thyroid was in balance and I corrected my diet and was able to know when I was actually ovulating, I got pregnant. That was after 5-7 solid years of trying everything.
Good luck and my thoughts are with you.