Period or pregnancy

I am a few days late on my period after having unprotected sex and I had just a little bit of blood come up when I wiped after going pe. Google said, "About 20% of women have some bleeding during the first 12 weeks of pregnancy. Possible causes of firsttrimester bleeding include: Implantation bleedingYou may experience some normal spotting within the first six to 12 days after you conceive as the fertilized egg implants itself in the lining of the uterus." So am I starting my period or am I pregnant??