Pregnant or not. The contraceptive pill?

So my last period was on 10 Dec. After which I had unprotected sex on 21 and on 22 I took a morning after pill. Now after taking that it was all fine until the 6th day. After which I started getting heavy cramps and got brown discharge with would sometime accompany with barely there blood. Also it wasn't regular. Like any other discharge it came in bits and after hours of gap. Like I had to use a liner instead of my pad because that was sufficient. Now even after 9 days it hasn't stopped and keeps getting the discharge/spotting whatever you call it. Only twice in these 9 days I saw exceptional amount of blood and that was it. I also get cramps still and no sign of period. So does this mean I'm pregnant? Or just the effects of the contraceptive pill?