2 periods one month

Hi everyone.

Last month I came on my period when I should on the 17th May 18 it lasted like it normally does for about 3 days.

What’s confusing me is I then started spotting on the 30th May 18 could this be another period? Or should I be worried? Could it be a early sign of pregnancy?

I’m 3 days late on what should be my normal period.

Thank you for your advice 😊