"nuvaring is effective in pregnancy prevention. however, the side effects were bad. the first month was fine with only one bad side effect (diarrhea) and i wasn&#039;t too sure if it was even from my birth control that month. it was never listed as a side effect. when i got my period it was light and lasted only about 2 1/2days. 2-3 months side effects started to kick in, more abdominal cramps, normal discharge, extreme bloating very often, nausea, and headaches. along with these i became extremely irritant/very grumpy, major loss in appetite, and when i did eat the diarrhea would hit (severely). eventually i had horrible back pain, and became very depressed and negatively impacted on my life."