I was on implanon (implant) that's in the arm (birth control) for about 2 years. I was having my cycle pretty regularly with the implant. I had it taken out February 2nd. Since then I have had unprotected sex. I have not had my period yet but I'm getting craps, nipples sore, back aches like I'm about to start? Is this normal? When should I expected my cycle? On average how long does it take to get back to normal?