Should I be worried?? Input please!

I have been having light spotting for the past almost three days (brown) it has slowly been tapering off and there is some light cramping but nothing intolerable. I pray I’m not starting to miscarry. But my husband and I did have intercourse three nights ago and the next day it started. Anyone else spot for several days after sex?? 5 weeks 2 days pregnant. Found out at 4 weeks. Input please!!