Help! Any advice ladies?

I have been trying to get pregnant for the last 6 months. Last week I had very light, pink and brownish spotting for 3 days. My period was due November 9th and I still haven't gotten it. My doctor did a pregnancy blood test and it came back negative. I have been feeling nauseous and cramping on and off for the past 2 weeks. Should I wait and see if I get my period? Should I take another pregnancy test? If so when? I'm thinking I ovulated later than expected but I'm just not quite sure!