Nexplanon implant

I’ve gotten the implant the 16th

My period was suppose to start the 20th

I’m two days late but I just figured it’s because of the birth control .did anyone else miss a period due to nexplanon?

Also I had unprotected sex last night andddd I dunno if that was two soon to be doing what is the normal time the birth control starts to kick in becatse now it’s day 6 with it in and my arm is healthing my the bruises are gross lookin but getting better