What are the disadvantages of Implanon NXT®? A change to the pattern of vaginal bleeding is the most noticeable result of using the implant. The changes are due to the effect of the hormone on the lining of the uterus. It is not possible to predict what the pattern will be for any one woman. Changes can include: changes in bleeding frequency (about one in every five women have no bleeding at all) irregular light bleeding prolonged and/or frequent light bleeding prolonged and/or frequent heavy bleeding The type of bleeding pattern experienced in the first 3-6 months of use may predict the ongoing pattern. For women experiencing continued bleeding problems, a change of contraceptive method may need to be considered. Women who are unhappy with their bleeding pattern should talk to their doctor.