Compost question

I've got a few plants growing in westlands go-gro it contains 4 month feed and working great so far my question is if I still need to add extra nutrients in with it? I'm not sure if the compost has the nutrients that cannabis needs for flowering.. Any help would be appreciated. Still new to growing

Usually pre mixed soils are okay to veg with. You'll need some flowering nutrients when you switch to flower. Compost would have been good to mix into your store bought soil. You can make compost teas with your compost.