Senna tea???

So I have been looking into ways to naturally induce labor and I came across a video about drinking senna tea. It seems like it would be safer than castor oil cause I mean..it's a herb but has anyone heard anything about it?? I don't want to do anything that's dangerous or that just isn't effective but if it's safe and it works I'm definitely going to give it a try. I can't imagine that tea would be unsafe but just figured I'd ask just in case! I will also be asking my doctor tomorrow before trying this so please don't freak out.. Just wanted to hear any experiences you may have had. Thanks!!