Can coming off the contraceptive pill make you gain weight?

I am a 27 year old female, 5'3...I have always been around 52-53kg my whole adult life, but in December I had a very stressful time when my dog got severely ill and my boyfriend broke up with me in the middle of that dilemma, and I went through a really stressful time and as a result lost Half a stone in about two weeks and started constantly spotting for a month...when I pulled myself together again, I went off the pill in January...but since then, I have had no period (I am not pregnant I've done 3 tests!) and my weight is going up at an alarming rate! I've darted up to 55kg from 51kg in about a month, I can see it on my body too, and my boobs have got bigger and my hips...not only I don't eat as much (or as care free) as I did pre December, I've been more careful with what I eat, I exercise more, and live healthier...but my weight keeps going up! I've booked an appointment with my GP next week but I'm putting a kilo on every week! This has never happened to me! Is this normal? I'm scared I'll be another 2,3 kilos bigger by next week!!!