I would think so.
Don't blame you. It's very "mind boggling", even for a believer such as myself. But yes, the trinity was always there, since the trinity and God are one of the same (different words for the same thing).
I wouldn't even know how to conceptually explain it... maybe a bad example would be that it's like three separate entities who are all directly connected via bluetooth?!
It's tricky stuff, but what it asserts is:
The Father is NOT the Son, and vice versa.
The Father is NOT the Holy Spirit, and vice versa.
The Son is NOT the Holy Spirit, and vice versa.
Yet, the Father, Son, and Holy Spirit are all "God".
Three separate "entities" who are all part of the same "mind" (God).