Do I have to get language credit if I am already fluent in another language for college admissions?

You need to reach a certain level, which most people reach in 4 years. Because college is more intensive, 3-4 semesters would be sufficient.
So, if the two semesters were Upper Intermediate/advanced, you’re good. If they were beginning level, it will be used against you because taking the beginning levels of a language you already know is considered “cheating” and isn’t allowed at many colleges.
At the most selective colleges, if you’re a heritage speaker with parents who have college degrees or it you’re a native speaker, you must show your ability to learn a foreign language - foreign to you.