I think quite a few people at BCM's residency don't have much research experience, so it won't be a total red flag. But since you're still early-ish in med school, you could certainly try to tack on a small project so you can say you got the taste of research and you might like to try getting published while in residency.
Also, I think a lot of people have done other "standout" things. You can travel to faraway places for a rotation or medical mission, you could set up some kind of child advocacy project in your city, you could work on medical quality improvement and measurement in an area that you find lacking.
Those are things I hear attendings talk about quite often around these parts...