"i have had my implant in for 5 months now. when i first heard about this form of birth control it seemed like a great option for me given the fact that i am incredibly forgetful and knew i would forget to take a pill every single day (it&#039;s an accomplishment when i remember to finish a full cycle of antibiotics). for the first six weeks i had it in everything was great. i had no periods, mood swings, weight gain, or any generally negative side effects. however, after those first six weeks were up i have experienced/been experiencing weight gain (approx. 15-20 lbs.), noticeable irritability/mood swings, and the absolute worst bleeding i&#039;ve ever had. it has basically been a consistent period for nearly 4 months now. switching to the pill asap."