Welcome!
You will need to confirm with your RCIA leaders and/or Priests, but most will accept a letter from you (since you were an adult) or a witness (typically in the case of an infant baptism) certifying that you were in fact baptized as sufficient evidence that you are already Baptized and don’t need to receive a new Baptism.
In our program, we typically ask the person or witness to include as much detail as they can recall – place, time/date if they know it (or even ‘summer of 1995’ or something). The most important thing is that we are sure it was done with water and in the trinitarian form. If that can be remembered specifically that’s great; if not, knowing it was done by a ‘mainstream’ Christian Church is generally enough. I believe Assembly of God Baptisms are considered valid, but I don’t know that for sure.
In the worst case, if it can’t be sufficiently confirmed, a ‘conditional Baptism’ might be done. That means you would be Baptized, but the liturgy would be slightly modified to say, “If you are not already Baptized, I Baptize you in the name of…” That way we can ensure that you are Baptized, but be clear that we only recognize the first valid one (whichever one it might be).