Need help!!

Okay so I need a little advice. Basically like last Tuesday or Wednesday I started spotting a week before my period would begin and then it went away for like a day and then it came back on the Friday for 4 days it was either light pinkish brown or brownish pink but this morning I went to wipe and now it is a brownish red I went to the doctors yesterday and she said to get a blood pregnancy test because when I took one it came out negative. Now I’m wondering if I should bother coz this could be my period and Im not sure what it is or what to do