Movement?

Currently 19 weeks into my first pregnancy, both times we've heard the heartbeat it seems like the baby is sitting on my right side. I've noticed in the last week my stomach is getting firm on the right side, so I'm assuming that's where he is. I still haven't felt any flutters or anything, is that weird? I know people may not feel movement for a long time but it seems like he's hanging out on the right and nowhere else. I probably sound silly but I'm so paranoid about everything, trying really hard not to be, but I can't help it. We go to the doctor on the 25th for our 20 week ultrasound so we will get visual then. I always get super nervous right before an appointment. So I guess I'm asking if it's normal for the baby to just be on one side, if that's even what the firmness is.