"i had my implant injected in june 2015 and its sept 2015 so in fairly new at this. i will say that my arm bruised for a couple days after injected. i had to apply ice for a couple of days before my arm was 100% useful again. after 3 months i haven&#039;t had a period and haven&#039;t really had any spotting. i have noticed some weight gain.. about 3lbs. i plan to keep an eye out for the weight gain. no other symptoms."