Helping labour progress?

Abbie
I'm only 35+3 but I've been drinking raspberry leaf tea as I've heard when you are in labour it helps labour to progress well? 
Is there anything else like this I can take aswell? 
Not to start labour just when I naturally go into it I want to have the best chance possible with normal progression. My first was an elective section and I really don't want another section (unless it's best of course)