It’s unclear if 20 pounds is the same amount you lost initially. If not, and it was more your first time, this is how I think about it. For me, the last 10 pounds took a very, long time to lose. It’s because your body doesn’t have much to give up, so the pace of loss is slower. Therefore, if you had lost a lot, and then put only 20 back on and now want to lose that, it will be slower. To help my mind set, I look at my logs and find the pace it took me to lose that last 20 or 10 pounds. Of course, I was a slow loser the whole time (other than the first week). Stick with it. 3 pounds in a week is good.