weight?

Bailey
How much weight should be put on by 20 weeks? I was 150 before I was  pregnant but I had just had a miscarriage so I gain like 5 pounds in that pregnancy then got pregnant again a month later. So I wasn't overweight but I was close to being overweight according to my doctor haha im only 5'4". So I guess I'm just wondering how much is normal to have gained by 20 weeks? Thank you! Oh and I'm currently 158ish so just not sure if I've gained too much or too little:)