There's a new study out that may give some women reason to breathe a sigh of relief.
Researchers say pregnant women with cancer may not be putting their babies at extra risk of health problems if they choose to have chemotherapy.
The findings were published in the Lancet Oncology journal.
Researchers looked at medical records from 70 kids whose moms had chemotherapy while they were pregnant.
Researchers found these kids were not at an increased risk of heart, hearing or general health problems.
They did find, however, the children of moms who had chemotherapy tended to be born prematurely.