"my body rejected mirena after a year, so my second option was nexplanon. i loved that was inserted fast and without pain. no painful periods, just spotting every 2 or 3 months. the bad side: weight gain. this is driving me crazy! since march 2015 i have gained almost 25 pounds!!!! i&#039;m 5&#039;1, i weighted 127 and was size 4. now, october 2015, i weight 150 and i&#039;m size 10!!!! no matter how many diets or pills i tried, i keep gaining more weight. i love not having heavy period or worrying about getting pregnant, but this &quot;weight gaining&quot; is scaring me because seems non stop. thinking about getting it remove, i think the perfect birth control doesn&#039;t exist."