I can be normal for period to start, stop and then return again. However, if this is not normal for you then I would take a pregnancy test just to rule that out.
If you test and it's negative then I'd say you're just having an 'off' cycle.
Be sure to test with first morning urine as it's most accurate.
My periods do this almost every month, so for me, this is normal. How heavy was your period when it did start? Did the bleeding start around the expected time of your next cycle? I would wait at least a week or so, and if it doesn't start up again, take a at home pregnancy test.