Switching birth control

Ka

So I just started taking birth control. I’m on my last week and just got my period. I went to the gyno yesterday and she gave me a new type. When do I start it? Should I start it tonight since I got my period or finish the rest of my pack. Unfortunately I am itching to get off it due to the side effects. I have never seen mood swings and moods come out of me so bad. And my poor boyfriend is the one I take them out on so you already know he wants me off them just as bad too😂