Confused

I just got off Birth control in the beginning of December. I barely had a period that month. In January I had a normal period. Now here we are in February and my period is very light and spotting. My husband and I are TTC and did so during my ovulation time. My estimated period start time was Jan 30th. I started spotting on Jan 28 and its continuing today. Barely even enough to notice. I have some period symptoms but nothing severe. I took a first response pregnancy test on Sunday Jan 31 and it was negative.