Spotting instead of a period

Hi for about 12 months now I've been spotting every month when my period is due so spotting  has become my period which lasts for 3 days at the most which Is not normal for me I used to get a heavy flow and last a week and not its completely different. Is this normal? Cos I've googled it and it doesn't help me and it tries to tell me I'm pregnant which I know I'm not.