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How to use raspberry leaf tea during pregnancy 
Consult your doctor. 
While many midwives believe drinking red raspberry leaf tea during pregnancy is safe, others do not think it's safe, so it's always best to consult your doctor before you start drinking the tea. For one, any kind of herbal tea or supplement can have interactions with other medications and conditions, so it's important your doctor knows about it.
She can tell whether it's safe to use. Limit the tea or don't drink it in the first trimester.