Overfeeding over a period will cause bloating. Assuming its a one-off and your fish doesnt show any sypmtoms (swollen belly, pinecone scales, bulging eyes, pale gills) I would just keep an eye on it.
Did the betta eat all 10? If any are left uneaten on the bottom i would try and remove them.
Im not knowledeable about bettas but i think 2 or 3 betta pellets twice a day is normal.