You’ll be fine, especially if your HS doesn’t list MS grades on the transcript. There’s no one formula to get into an Ivy-----but it’s common to have strong grades and test scores (look at class profiles to get an idea, and you’d want to be on the higher end if STEM,) extracurriculars that show leadership or long-term committment and are related to your intended major etc. Right now focus on building good study habits for HS, the rest’ll come later.