Implant

I'm 15 years old and started my period at the age of 11. The day before I started my period my boyfriend and I had sex and now I'm really light, this is the lightest I've been since I have started to have periods. My GP (the head nurse) has told me I can't get the implant unless I get it inserted during my period, as I'm really light (it's nearly the end of my period so it's close to just spotting) I'm worried that I won't be able to get it? I'm meant to finish in two days time and tomorrow (the day before I finish) is the day I'm meant to be getting it. Does anyone know if I will still able to get it or not? And if I do get the implant when my period finishes what will happen? Does it effect you differently/can it harm you? It sounds silly but I'm just worried and generally looking for re-assurance xx