I just got the nexplanon birth control in my arm about a week and a half ago, this Tuesday will be two weeks. The nurse who came in before the doctor said to wait 4 weeks and the doctor who put in the implant said 2 weeks. But then I read online that it's only 1 week. How long should I wait? Am I protected already? I am just a little nervous it's not working or something because she said that I will probably bleed and I haven't. I didn't get the implant while on my period.