Erin, please be careful.
Raspberry leaf is a powerful herb, it works to tone the uterus by causing contractions, which can lead to pre-term labour.
It's use during labour to help reduce the pain has been documented, but the use before this isn't well researched and not endorsed by medical society.
I would really recommend you don't do it, but it's your body and well, I figure you as quite bright, so just be careful, weigh up the risks against any possible benefit.