This should be checked out by a doc, preferably a hand surgeon. You certainly need a tetanus shot or booster, especially if it has been a few years since the last. Also, sometimes these wounds on the digits are treated differently and left more open than wounds elsewhere, because if it becomes infected and the infection moves inward, you could lose the digit.

By the way, if it was your own blood that you cut, doesn't matter that you reuse the same blade. After all, if there is a "blood bourne infection," you already have it!