If i drank alcohol before knowing i was pregnant would my torso feel sort of bruised the day after in reaction to drinking alcohol in early pregnancy?

I have no clue: And don't quite understand what you mean about "torso feeling bruised." what risks there are to your unborn baby are probably relatively small, but that depends on how much drinking you were doing and how often. Your obstetrics provider can do a variety of tests to look at the baby's health, but this would be usually done somewhat later in the pregnancy. Your doctor should evaluate your pain.