Hi Doc, I Currently Using Implanon And Planning To Switch

Hi Doc, I currently using implanon and planning to switch to diane or althea and was wondering are these pills helps me to gain weight,,because 1 year ago after I give birth and use this implanon I started to loose weight and now I planning to use pills that helps me gain weight. And if I may I ask if going to use this pill am I going to have a period?