Has this happened to anyone else before??

Sorry if this may be a little gross...But I just ended my period yesterday (it was very very light), and after I finished masturbating (I used my dildo this time; I rarely do), I went to the bathroom and saw some red spotting. I'm a virgin. Is this okay? It's happened before, but only once. Am I being too rough on myself, or is it just my period being weird?