So here is my dilemma Sunday my fiance and I had unprotected intercourse and I started spotting yesterday afternoon. Not really much of anything....but I did figure that it may have been a possibility that I could have conceived. Well today my spotting is more like a period but still nothing I am used to. So I am wondering how you tell the difference between bleeding during pregnancy and a period. I know that I have to wait about 4 weeks before I can test, but I am still curious. And I have already been told that spotting for pregnancy wouldn't show up that quickly...but my body does everything quickly.