Question time

I have started the raspberry leaf tea as of Friday (loose leaf), i started on 2 cups per day buti really enjoy drinking it! So i am is there a limit to how much you should drink and if so what is it? I had 2 on friday and 3 on saturday adn 4 today.
I figure I won't go over the 4 cups but wonder if its ok to drink this much each day. I am not drinking it for teh benfits of labour as such as i labour well (first 11 &1/2 hrs, second about 6hrs, 3rd around 4hrs and 4th around 3hrs) plus i ahve had two c-secs, my first nearly 17yrs ago and my last nearly 15mths ago. I am going for a Vb again this time (as long as all goes well) but as I am classed as a grand multi (after 5 births) I have a higher risk of excessive bleeding and have heard that RLT can help with this and also help uterus go back nicely afterwards.

So any info would be great
Thanks in advance