can you send your grades after application

Hi i am currently a senior. I have a pretty good extracurricular, with 1400 on the sat. My grades were mostly A’s (6b). However this year literally went down a lettr grade. I got all B which is ridiculous. I took 5ap classes and 2 honors clases, which turned out to be a bad idea because of the medical condition i had. Although i am mentioning it in additional info and counselor is mentioning it, i am still very nervous. How much would this affect my chances of getting into good schools? Not ivies but school i am specifically aiming is emory oxford. Can i still send in at least the first quarter of second semester? I know i can do better and i want to show some improvements.