Well, there are several factors that can determine whether or not you've overloaded your yeast. If you can post more information, the more experienced folks around here can verify for you one way or another. They'll likely need to know what yeast you used, and what your Original Gravity was. If the OG is too high, it can cause your fermentation to get stuck. The OG could be estimated, but an accurate reading will always be better. If you can add more information, I'm sure you'll get an answer pretty quickly.