Took oral steroid late nov. last period:late &short. this month:2 days dark brown discharge and days of brown spotting. imbalance or implantation?

One cannot tell: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result if done correctly. One can test about 3 weeks after sex (3 weeks after when conception might have occurred), 1 week after missing a period, or 1 week after having a "weird" period.