REMINDER: if you have a vagina and want to use Plan B as an emergency contraceptive, it loses effectiveness if you weigh more than 165 lbs (74.84 kg) and is completely ineffective for those that weight more than 176 lbs (79.83 kg) (x)
You can get ella, an emergency contraception pill that is effective at any weight, here. It requires a prescription, but you can do the consultation for that online.
This is terrifying because I had no idea