Hi, my name is Noelle. I'm afraid I might be pregnant but I'm on Nexplanon. My regular doctor told me it was gonna take four weeks for it to start working. Like 3 or 4 days after I received it , I had unprotected sex with my boyfriend . It's been almost two weeks since this happened . In just scared because I have the worst mood swings, cramps everyday but no blood, headaches, nausea, etc .