Should I be concerned?

I am younger than 18 and I am 3 days late to my period and the last time me and my bf did it was on the 8th but he didn’t cum

Am I overreacting? Could I be pregnant?

(I’m unable to get a test until next week due to my bf getting his check this Friday)

I’m just really confused and scared...help

(Edit: We didn’t use protection like the brainless idiots we are)