I was 3days late on period, then finally yesterday I started spotting, it was on and off. Very light. The color was brown. I took a First Response Test yesterday,the test said negative, but the line was light pink(faint) What does this mean? Could I be pregnant? Its been a week, since I had sex. But I was due for my period the week after, which I ended up missing it after I had sex, and spotting started 3days late but that's all its starts then stop

Did a line show up in both windows? The control window and result window? You need to test again in a few days if you are pregnant your HCG levels will have increased by then and show a more accurate result on the test, oh and always use first morning urine!