Activating virtuaenv with custom script

I would like to run a custom script in order to activate my python virtualenv while using Pycharm.

I have a `.sh` that run some logic to set environment variables (and other stuff) and in the end activate the virtualenv (with `source /usr/local/bin/virtualenvwrapper.sh`) how can I run it when opening a new terminal window [instead of running the "normal" activation script (`source my_project/bin/activate`)]?

Thanks