Gaining weight.. again

I gained more than 1.5 kg (about 4 lb). (x_x；). I didn't have chance to go to the gym for about two weeks because of class and job hunting. I was studying all day long this weekend too. I felt dangerous about my lifestyle now. so I did Yoga today. It's been a really long time since I did it last time,. My body is just not flexible now... I always feel my body is lighter after I did Yoga. So I hope I can keep doing it regularly.