Curious

Hi everyone! My period ended this past Sunday, the 17th, and now today I am having some spotting and pain just on the right side of my abdomen. Any idea on what cold be causing this? I can't imagine it would be ovulation so soon after my period, and I haven't had intercourse during my period, or since my period ended. Has anyone had something like this happen, or does anyone know what might be happening? Thanks everyone!