I'm 22 years old, female, 27 weeks pregnant with my second child. I have also been sober for almost 4 1/2 years (using IV). I woke up early this morning, well before I needed to be awake and could not fall back asleep due to an odd aching pain shooting from the inside of my elbow to the inside of my wrist. When I finally got out of bed, giving up the attempt to fall back asleep, I noticed that a small bruise about the size of a dime but oval shaped appeared on the inside of my elbow where the pain originated. The bruise is a dark yellow at the moment and it's right on top of a vein. Is there some possible explanation? Should I contact my doctor, if so which one? And how urgent of a matter could this be?