34 C.F.R. §106.40
The US Department of Education’s regulation implementing Title IX specifically prohibits discrimination against a student based on pregnancy, childbirth, false pregnancy, termination of pregnancy, or recovery from any of these conditions. The Title IX regulation also prohibits a school from applying any rule related to a student’s parental, family, or marital status that treats students differently based on their sex.
Under Title IX, it is illegal for schools to exclude a pregnant student from participating in any part of an educational program. This prohibition applies to specific classes such as advanced placement or honors classes, extracurricular programs, interscholastic sports, honor societies, and opportunities for student leadership, among other activities. Schools may implement special instructional programs or classes for a pregnant student, but participation must be completely voluntary on the part of the student, and the programs and classes must be comparable to those offered to other students.
In addition, a school must excuse a student’s absences because of pregnancy or childbirth for as long as the student’s doctor deems the absences medically necessary. When a student returns to school, she must be allowed to return to the same academic and extracurricular status as before her medical leave began.
US Department of Education’s Supporting the Academic Success of Pregnant and Parenting Students: Under Title IX of the Education Amendments of 1972, June 2013