Red Raspberry Leaf Tea?

fivefeetsmall

So my Mom has been doing all this research and feels like me drinking Red Raspberry Leaf tea would be a good idea to help with labor and get my body prepared. I don't mind drinking it if it may help labor and delivery, however even at 38 weeks I'm fearful of trying anything that could bring her out early. My sister has been going on and on about how both her kids were 36 weeks when they were delivered, but I just don't want to take any risks. Has anyone else tried this? Is it going to put me in labor before my body is ready? So far I've had zero cervical change...still closed and firm, though I know that could change on a dime. 

Anyhow, what are some thoughts?