It’s stated inside the website which is the same as this app. She is just sharing.
Raspberry leaf tea: Raspberry leaf is a good source of nutrients and contains antioxidants. Firstly, it helps with nausea and vomiting during the first trimester. Next, it is also recommended to consume this during the second trimester and third trimester of pregnancy, as it strengthens the uterus and reduces the likelihood of excessive bleeding after childbirth