Lowest Gear Out of Whack
Here's a video that explains how to adjust your rear derailleur. Since you didn't mention adjusting the high gear or low gear adjusting screws, this may be your problem area. Sometimes it's best to start with all adjustments in a "neutral" condition before you attempt to "fine tune" the derailleur. It would benefit you to tell us the brand and model of your deraileur syatem the next time you have a problem. Even different models from the same company, can have their little "quirks" ofetn learned by experience rather than instructions. Hope this will help you out! Good luck!