Should I test? Freaking out!

So I had my nexplanon removed on June 7, and got my period from June 11-18. The app says I was supposed to be ovulating June 27 and I did have sex June 28 (we used the pull out method) but now according to the app I was supposed to get my period two days ago! I have been cramping and a little nauseous but no sings of my period not spotting or anything should I test? Or give it a few more days? Has anyone experienced anything similar after taking out the implant?