I am 17 weeks pregnant. I have gained so far a total of 13 lbs. I have been weighing myself every morning. I am a bit concerned to see that from one day to the next my weight jumps 2 lbs up and sometimes drops a lb. is this something that I should be worried about. I am trying to stay in my range of gaining weight. I know I have gone over already but don't want to gain too much. I had gained over 50lbs with my first child and I don't want to gain that much again. Putting on 2 lbs in a matter of 24 hours can this be water retention.