Short answer. Not clearly. The Labor Code protects an employee who has filed a complaint or instituted a proceeding, and separately protects one who has testified or is about to testify. It does not, on its wording, extend that "about to" protection to someone who merely intends to file a complaint but has not filed it yet.
What the law says
It shall be unlawful for an employer to refuse to pay or reduce the wages and benefits, discharge or in any manner discriminate against any employee who has filed any complaint or instituted any proceeding under this Title or has testified or is about to testify in such proceedings.
Labor Code, Article 118 — Retaliation Prohibited. Read the full provision →
What the article's wording actually lists
Article 118 names four situations: an employee who has filed any complaint, one who has instituted any proceeding, one who has testified, or one who is about to testify in such proceedings. Notice that the "about to" language appears only in connection with testifying. Filing a complaint and instituting a proceeding are both phrased in the completed past tense — "has filed," "instituted" — without an equivalent "is about to file" alongside them.
Why that distinction matters for your situation
If you have not yet filed your complaint, you do not fit the "has filed any complaint" category as written, and the article's "about to" phrasing is tied specifically to testimony, not to filing. Read strictly, an employee who is merely planning or preparing to file, but has taken no filing action yet, sits outside the four categories this article spells out. That is a real gap between what the article protects and the situation you are describing.
What is clearly covered, for comparison
To be clear about where the line falls: once you have actually filed the complaint or instituted the proceeding, Article 118's protection against a refusal to pay, reduction of wages and benefits, discharge, or discrimination applies from that point. The article is also explicit that someone who is about to testify is protected even before testifying happens — that specific "about to" protection simply was not written to cover the act of filing itself.
What this means practically
Given this gap in the text, the most direct way to bring your situation within what Article 118 clearly covers is to actually file the complaint or institute the proceeding, at which point the protection unambiguously attaches. This article's wording does not let a bare intention to file, on its own, be treated the same way the text treats an employee who is about to testify.