I just had 2 second molars removed today. now i have like a bruise on the roof of my mouth and its quite painful. is this normal?

Bruises oral surgery: Yes it can be normal but speak with surgeon if symptoms worsen or don't improve soon

Could be: The roots of the molars are quite deep so something's takes a lot to remove the teeth. Very possible to have bruising. Discuss with your dentist if you have any questions.

Surgery: You just had surgery. Expect some soreness that should rapidly improve. Please speak to your surgeon.