Nervous scared, i think I'm being crazy.

So my OPK said I was fertile today, it was flashing a smiley face. Anyways my bf and i won't be able to BD until tonight. I'm seriously thinking that my egg is like a ticking time bomb and will blast off without it joining with sperm. lol I'm thinking crazy I know but I'm scared we won't BD in enough time :( please give me some hope ladies and tell me I'm over thinking lol