Maybe pregnant

Hey so I’m new here and this is my first time posting in here also I just have a question I’m scared lol so it’s the 13th and my period usually comes in the beginning of the month last month it came on the 8th this month it’s still not here .. I don’t want to pregnant I akrasdy have a daughter that turns 1 Wednesday I don’t want another kid atleast for another 4/5 years or until my shit is more together so basically I just wanna know if I’m pregnant or not maybe I should wait a lil more will a plan b work? What can I do 😩