Do tampons make your period lighter???!

Gabby

So I usually have quite a heavy period, but whenever I use a tampon ( generally when I swim or do dance, which is four times a week) my period goes really light for about 12 hours, then goes back to normal. Once, when I only used tampons on my period, I was so light it hurt to put the smallest size in. Why does this happen, and does anyone else experience this???