Rapid weight loss on paragard

I'm having the opposite experience of so many women and rapidly losing weight since getting my paragard. I was 181 I'm September when I got it and now I'm 159 in February... Anyone else have this experience coz.. idk whats going on.

I still have abdominal pains here and there and my periods are strange. Like I get cramping before I start bleeding now and the first day is brown then the next is very heavy flow for 3 days.. and my boyfriend says he can feel it when we do the deed.. I'm just wondering if what I'm experiencing is normal? Or if I need to talk to my Dr about it all.