Scared as hell someone plz help me

Belikov
I had unprotected sex with my boyfriend ..he withdrew before he had n orgasm but he may have dropped 1 or 2 drops of seman in me ..i got scared n took plan B with in 2-3 hrs n i didn't knew i was on my fertility time my glow showes 8 or 9%  fertility ..im really really scared ....plz give me suggestion ....