Does Light Bleeding During Menstruation Mean Pregnancy?

Hi, my husband and I have been trying to conceive and have been VERY active this past month. My cycle is usually 30-32 days and this month i was two days late, then began spotting and my period began, instead of being the usual very heavy cycle ( heavy for 2-3 days then tapers off) it was EXTREMELY light. I usually pass blood clots, have cramps and this cycle, there has been NOTHING! No cramps, no blood clots, nothing. just very very very light bleeding. I have no idea what to think.