Spotting

Has anyone ever had spotting while ovulating? My fiancé and I had sex on September 15th and I started my period on September 26-October 2nd. Well today,October 9th I started to ovulate and I had a light pinkish (spotting) occur. Never have any thing like this happen before. My last period was a lot more old nasty blood than new blood. I have been very nauseous and feeling tired. Could i be pregnant ? I took a test tonight and it said negative. Could it be to soon.?