UPDATE: (19&trying)

Sooo I already asked about advice for my boyfriend and I since we're "trying" more like we just haven't used any protection in the past week. Im 9% chance of getting pregnant I think? Or is it 9% of how fertile I am. I forgot.. anyway, we haven't tested or anything and I start my period around the 12th-16th usually. It changes sometimes. Should I wait to see if I get a period or should I test at all?