I broke my left big toe in February sparring and it took me a while to get back to normal (probably about 5-6 weeks). Turning on the left foot and pulling the toes back to hit with the ball of the foot was problematic for a bit but did come back to normal.
Now, everyone is different so you might want to give it another week to see if there's more improvement. As long as there is no pain during normal movement or walking I wouldn't worry about it. But if another week or two passes and you're still having the trouble you described I'd suggest going to the doctors and having an X-Ray just to be sure it's properlly healed. (If you're experiencing pain when hitting a heavy bag with your instep you might need more recovery time for the bone to completely knit.)
Pax,
Chris