If you are only worried about 5 lbs then you have nothing to worry about. Try not to worry about that #. You need to gain weight for your baby. You will lose it all after the baby comes.
just make sure your eating healthy, cut out highly processed, sugary food and replace with wholegrains, lots of veges and fruits
Were u underweight before pregnancy?? Even if u weren't the average weight gain is 25-35 lbs but some gain more and some gain less... if ur doc isn't worried u shouldn't be