If you have a 3 or higher in an AP language other than English exam, you fulfill the UC language other than English requirement.
However, not all colleges like to see AP scores from a heritage language as the only means of fulfilling a foreign language requirement, recommendation, or expectation. But if English is a recently learned foreign language to you, that may be an exception to some of them. When the college lists “4 years of foreign language” as a “recommendation” and gives no other detail for situations other than an English-speaking American taking foreign language courses starting in high school, it can leave some applicants guessing about whether their different situations are acceptable to the college.
It would be possible to take French 2 as a junior and French 3 as a senior to get to level 3, which could be more helpful at colleges that are less willing to allow for AP scores in heritage languages. But that could come at a cost of displacing other course work.