https://www.sciencedaily.com/releases/2020/06/200629090003.htm

A recent Washington State University study of pregnant women in physically demanding jobs showed that the majority, about 63%, felt this type of "stereotype threat," the fear of confirming negative assumptions about a group to which they belong. The study, published in the journal Work & Stress, found this threat led many women to conceal their pregnancy and overperform, even taking actions that placed their health and pregnancy at risk, such as standing for long periods or lifting heavy objects.

The study shows the need to acknowledge that these stereotypes exist and help mitigate their impacts, said Lindsey Lavaysse, lead author on the paper and recent WSU Ph.D. graduate.