so me and my bf did it with out a condom on December 7th on Monday and he pulled out before he came and I was starting to get really scared if I could be pregnant so I took plan b December 10th in the morning than 2 days later I experienced wanting to throw up and having headaches an stomach pain and I hear that your suppose to have brown spots and it's been 8 days since me and my bf did it and it's been kinda off and on with the headaches and wanting to vomit and stuff could it mean something??