I'm currently on the implanon nxt (bar) and have been for about 3 years now, and had it changed at the beginning of this year. I continued to get irregular heavy periods so the doctor put me on levlan ED for 3 months with no change, getting told to not take the white pills. 2 months ago they changed it to microgynon 50 ED (I'm still on the bar) and I still continue to bleed excessively.