Anovulation and weight loss?

Hello everyone! My bf and I have been trying to conceive since Oct 2009 (also I have had no periods since 0ct 2009). Well with no luck, I decided to go see a doctor. I recently (July 2010) was diagnosed with hypothyroidism. Once I took medication, I started my period and ovulated but that was short lived and only happened for one month. Well, I went to the doctor on Oct 27, 2010 and he diagnosed me with anovulation. He told me to lose 5% (15 lbs) of my body weight and I should start my cycles again. Well, I have been on the Atkins diet since Oct 27, 2010 and I lost 15 pounds. I started my period yesterday. However, it is really dark brown and barely gets any on my pad. Is this normal? Will I start to ovulate again? Is this actually a period? Sorry for all the questions but I am nervous and excited!