Cramps while on the depo shot

Is it normal to have cramps while on the depo. This is my second week of being on it and everyday since I’ve been on it I’ve had these horrendous cramps. I didn’t have my period which my doctor told me was normal, and I’ve actually been losing weight from being on it. Since I started it two weeks ago I have lost a total of 8 pounds. This is normal to me because the last birth control I was on i had the same thing with my weight. I think I’ve been losing weight because it may sound weird but I’ve become more sensitive to smells and they make me nauseous. Is this kind of stuff normal?? Any information will be much appreciated!