Red raspberry leaf tea......

Mrs.F
I've had 4miscarriages, we'll start trying again in May. Someone told me that red rasberry leaf tea might help to not miscarry. Has anyone heard of it? Or has anyone tried it? If so, is it used while ttc only or during pregnancy as well? I'm sorry for all the questions, I'm just nervous, excited, and scared at the same time....thank you ladies and baby dust to all.....