Pregnant?

So my last period was on November 25th. I didn't have a period in December BUT I did have a brownish discharge on the 14th of December. (At the time I thought it was my period, but it didn't even last for a whole day so I ruled that out.) I took a pregnancy test on the 24th of December and the 28th and they were both negative but it's January 9th and I still haven't had a period.