quitting birth control

I'm finishing my pack and after I take my pill Saturday I'm quitting birth control. It's just caused me to be non romantic and I just feel emotionless. I've gained a ton of weight and my sex drive is a dead 0. My boyfriend came in me on Monday, and since I'm gonna stop taking the pill after Saturday, so I'm still protected for that sex on Monday right ? And once I stop taking the pill, will when I get horny again and get my feelings back?? And when will I start to loose weight ??