Hi, i am 18 and i got implanon about 10 months ago, i have had no major side effects and no periods what so ever. I exercise regularly and have been very happy on this contraception. However these past 2-3 weeks i have been getting heavy periods and swollen and sore breasts, as well as occasional cramps in my stomach. I have no idea how long this is going to last or if i should be worried and see a doctor. Please make any suggestions, thankyou for your time.