Help!!!

I had unprotected sex a week ago which was the day before I started ovulating. The <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> app itself said there was a 7% chance of pregnancy. Fast forward to today & I am spotting & cramping but my next period isn't due until Dec. 1st. Is this implantation bleeding?