helppp i’m nervous

i just had sex a few hours ago and he nutted in me. (baffled) my fertile week starts in 2 days now (it’s considered the next day now since its 2 am) and i know sperm lives up to 3-5 days in the vagina. Do you think i will become pregnant?? it’s right on the boarder line of when the sperm will finally die of. I would take a plan b but it’s not effective for people over 150something and i’m 175-178 so idk what to do. Plz help 🙏🏿 (he also smokes cigarettes so his sperm count might be low)