Nexplanon helppppp!

So it’s been 4 weeks since I’ve gotten my nexplanon out and I have no period yet. I spotted veryyyyyyy little the weekend after but only for one day and I’m pretty sure it was because of having rough sex. The first 2 weeks I would cramp as if I was going to start bleeding any second but nothinggg!! And now I just don’t cramp anymore. Idk what it could be😫 I took a pregnancy test last week and it was negative, any feedback of your experiences would be great! And no I’m not ttc