Possibly ovulated twice?

So I am just wondering. I had my period 08/12 and the opk kit (used clear blue digital with the circle for low fertility, flashing smiley for high fertility and solid smiley face for peak) on the 21st I had the peak smile face (solid) I than just for fun tested on the 25th and it was still solid peak high fertility.! So for 5-6 days which is weird. Do you think I ovulated twice and could possibly be pregnant with twins inside of just one baby? Anyone else have this happen?