I'm on nexplanon but I had sex 3 weeks ago and I've been having pregnancy symptoms for about 2 weeks. I've been nauseous nearly every day, cramps, light headed, fatigued, bloated, and my boobs are swollen. I know it's a low chance but I'm so scared that I'm pregnant... I'm only 16! I have plans for my life that don't include a baby. Ever. Has anyone gotten pregnant on nexplanon? I heard that antidepressants can cancel birth control out and I'm on Zoloft.