I had sex January 16,18,and 19 and my boyfriend did not pull out. I usually start on the 21st but this month I started on the 10 and it was very light and brownish. It did not last very long just a few days. I took a test and it came out negative I'm not sure if it is too early. I have lower back pain, head aches, and vommiting. When should I take the test again.