“I have a friend who isn’t on any birth control. She and her boyfriend have recently been having a lot of unprotected sex. She recently has been having a lot of trouble eating things such as bread and milk because they give her an upset stomach. Can an early pregnancy cause symptoms like that?“
Early pregnancy can indeed cause a change in women’s diet. Some women find foods intolerable, may crave other foods, or may experience nausea / vomiting. Encourage your friend to see her health care provider.