If you're late in the third trimester, you may have also reached the end of your pregnancy weight gain instead of "going up" as per usual, the numbers on the scale in the last few weeks of pregnancy may not be going anywhere — they may even be going down, tracking a weight loss during this home stretch. Losing weight during pregnancy in third trimester. Researchers found that women who received advice between weeks 7 and 21 of pregnancy were less likely to gain excess weight during the third trimester the same group of women studied also. losing weight during pregnancy in third trimester Sofia vergara poses nude for women's health Growing babies gain the most weight during the final trim...