You would get reliable results from a pregnancy test two weeks after the unprotected sex.
I also noticed that my stool has been colored differently the last three days. I'm not eating anything abnormal...
You're not pregnant, and are looking way too much into this. Abnormal stool is a sign of digestive problems, not pregnancy. What colour is it?
you guys were right. i'm a week late but yesterday i woke up to find i had started my period.