Looking back at your previous threads on the boards, I see you know the effectiveness rates of condoms. Those are based on real people having intercourse at all times in a their cycle, including fertile days.
Did you read this article Sam shared? Have a Little Faith in BC
Feeling worried isn't a context where most people feel sexy and like they'll enjoy sex, so I also want to ask if you have taken a step back and asked yourself about whether having intercourse on Thursday is something you want and feel good about, or if you'd prefer to do something else or be sexual in other ways?