Chances of being pregnant

Kay❌
I'm 15 and I have a regular 28 day cycle, on the 13th of February I had unprotected sex with my boyfriend and we used the pull out method, I know he pulled out because he came on me. I had 8% chance of fertility on that day. Anyway, two weeks later when my period was due it wasn't like usual, normally I'm really ill and come on early in the morning but that time it was late night and it was painless and lasted about 3 days. I thought nothing of it but now this month my period is late by 6 days, what's the chances I could be pregnant? Going to take a test tomorrow
Also I've been under a lot of stress lately so it might be that?

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