Nexplanon, bleeding

Madison

I got the implant mid July and when I got it in I bled for about 2-3 weeks straight, but then my period sort of regulated. I had sex last week on my period and now it won’t stop. I had been spotting for about two weeks including my actual period, and for the past few days now I’ve been spotting a little in the morning and then it stops. Is there a reason this is happening? Is it just a spastic regulation? Is something wrong?