Help not sure what to do

of course you may feel a way about it but let it go honestly speaking i personally wouldn't tell her to cancel her plans cause it'll make me sound selfish in a way. You can always ask her to go out afterwards or before hand if you want but please don't take it to enjoy. It's your day you can always spend it with family and friends. But if i were you i would just focus on my a-levels and hopefully if the results are good which they will be i will have time to celebrate my belated my bday. Arleast you're doing something on friday to celebrate which is nice and i hope you have a lovely b-day and just enjoy it. wishing you all the best with your a-levels xxx