At various places on UC websites they say "A CCC transfer student is one who has completed at least 30 semester (45 quarter) UC-transferable units at one or more California community college. " Such as at https://admission.universityofcalifornia.edu/_assets/files/transfer-requirements/tag-matrix-23-24.pdf
So another question is how did you accumulate your units? If enough are from dual enrollment you may qualify but if they are mostly AP then maybe not unless you take classes in addition to the 3 you mention. I suggest you contact UCSD admissions with your planned courses and ask them if you’re trying to use the CCC advantage.