Extremely tender breasts, nexplanon implant 9 mos. unprotected sex. any way of being pregnant?

Pregnancy unlikely: Nexplanon is among the most reliable forms of birth control. It is >99.99% effective; fewer than one in 1,000 women using an implant will become pregnant. Breast tenderness is not uncommon in young women. If you are concerned about pregnancy, you should do a pregnancy test to be sure. You should be checked for sexually transmitted diseases (STD). Protect yourself, use condoms consistently.