Gaining weight while pregnant??

I am pregnant with my first child! Not sure the sex yet. I am a few weeks, I just found out earlier this week. I have read many articles about you should only gain 25-30 lbs when pregnant. I am 5"11 and I usually weight between 130-140. It fulucates. I feel myself eating alot sometimes without meaning too. My husbad has said that the weight you gain while pregnant is very hard to get off!! I need help bc I'm not sure what to doo.. The right things to eat. etc.