I low carbed for 1 1/2 years. In the first 7 months I lost 70 lbs and never felt better. I have maintained now for over a year. I have PCOS and wasn't able to conceive again after my son was born in Dec. 1995. Since losing the weight and getting my insulin levels down to normal, I am now pregnant!
This "diet" (I hate that word) has given me back my life and I can't say enough about it. It does get tiring if you let it. You have to be creative. You may even need to take a break from it at times, but after trying diet after diet from the time I was 8 years old, I finally found what worked. Although I cannot "low carb" while pregnant, I CAN make better choices with the knowledge I have. Also, you should exercise. That also makes a big difference.