Whats wrong with my body?

I have 2 toddlers and on the stick birth control and everything i eat i cant burn it off im getting soooooo fat !!!! I cant lose weight ! Is it the birth control or just mee??? I need to lose weight!!!!!!!!!! But idk how cuz im eating lesss Nd not at night anymore ..... after my 1st baby i got skinny without birth conntrol after birth but after my 2nd baby and the nexaplonon i got biggggg!!!!! Please i dont wanna get sick. I weigh 170 the max. And im 4'11 height and 30 years old..