anxious

basically, it was maybe 3 mins of sex he didnt come close to ejaculating at all so he didn't cum inside me, just worried about the possibility of it being precum. took plan b 2 hours later. this happened on my 22% fertility day according to glow.. so it happened 6 days ago and I'm having mild cramps in my pantyline area.. what are my chances I could be pregnant? period due in 6 days