Could Spotting Be Due To Pregnancy?

hello i am in need of some answers my normal menstrual is the 23rd of every month it used to come on on the 3rd of every month i went thru a change and now it was the 23rd of every month well this month it was very odd to me because it was orange in the beginning and now after 2 days its starting to tapor off,could i be pregnant or is this normal