Yes! As blchandl2 said, try some dry fire drills.
If you fire from about 10 yards and the groups is very small, you may have to adjust the sights. But if at 10 yards you are not keeping your shots within about 2" or less, it's probably just a problem with your shooting.
New gun, so you may just need to get used to a new feel, and learn to use it.
I have a KelTec 380 with no sights at all. It shoots about 3" left at 15 yards. I used to think it shot low too, but after firing about 300 rounds from it, I found it was me that was shooting low. Now I can keep the shots in a group about the size of a goose egg at 15 yds. They are dead level, but 3" left. When I first got the gun I shot about 6" low and into a group about 6" around. It was mostly just my shooting.
Dry fire a lot, and shoot a few magazines from your Ruger every day or at least 3 times a week and see how you improve. If you start to group tightly, and it's still low, then you can cut the front sight down a little bit to bring the muzzle up. Only do that AFTER you can shoot tight groups consistently.