Plz help !!

↞ηιcσℓε♡↠ • 15 very long years of ttc! Not giving up though!!
I had a short 2 day period the 4th and 5th with spotting the 6th and 7th and it says my next period is in 12 days. Even though I had a short period why would it say I'm gonna get another period so soon? I'm so confused! I've never had a short and lightish period before! Plz help !