Should I be concernced???

Ally

I'm about 9 days late on my period but got a negative pregnancy test when I went to the ob/gyn on about the 4th or 5th day of missing it. I had a brown or blackish discharge and then some clear with pink and red but not a full on flow. Me and my bf only had unprotected sex 2 times after the negative pregnancy test and he pulled out both times but I know that doesnt always work. Should I go take another pregnancy test or just wait?