About a week ago, I had unprotected sex. I am on the birth control pill called Chateal, but I have only been on it for almost 3 months. Immediately after sex, I started feeling nauseous. My stomach felt like it was turning. I felt like this for at least 2 days after the fact. Today, I noticed what appeared to be blood clots after using the bathroom. They were reddish-brown in color. I have been continuing taking the pill, but I'm not sure if I could be pregnant because of these symptoms.