Help

i done one of those clear blue digitel tests 4 days before my period n it said pregnant 1-2 week, so I did another test but the same brand and it came back pregnant 1-2 weeks, so thought cool anyway my period due date came n went, so on Saturday afternoon I had some spot bleeding then it stopped n started and then went brow, so I did another test first thing Sunday morning and said not pregnan. So just woundering if anyone has had the same. I'm really not sure what to think. Xxx