weird period??

Please share your thoughts. I started my period on time on Friday but instead of having a normal period I only seemed to spot or light bleeding. It was pink or bright red for 3 days (only one day of consistent spotting/light bleeding. I did have 3 hours of bad cramping but actually better than normal. I usually bleed heavier than this. Is it possible this wasn't my period? If it was my period should I be concerned? sorry ttc for a while and over think everything now.