hello i have a question, i have been having slight headaches, and lower back pain for about a week, last week i spotted for three days and i only seen it when i wiped, my period was supposed to start this week but it has not, i took a first response today but the test came back negative, now with that being said i do have a six year old daughter, but i didnt experience any symptoms with her, and when i did go to the doctor for a test i was already four weeks bt the line was fairly light at that time, is it possible that i could be pregnant