I just got off the depo provera shot on June 2013. I was on it since November 2011. I had light red bleeding this month on December 12 for 2 and a half days and then again on December 20 for 2 and a half days too. I used not even half a liner pad for both times. I have been sexually active with no protection. I took a dollar tree pregnancy test and it came out negative. What could be wrong? I've also benn having low mild back pain and cramp like pain on my lower abdomen

So are you trying to get pregnant ? Are you tracking your ovulation ?

Is your period regular or does it differ ?

How late are you ?

After two week late, you test for pregnancy with first urine of the morning.