What prodrome symptoms tell you you're for sure in for a migraine?

Title is self-explanatory. I get various prodrome symptoms throughout the week, but they don't always lead to a migraine.

I'm curious if anyone has a specific symptom that always (or almost always) leads to a migraine.

For me, my prodrome symptoms include a mish mash of nausea, difficulty sleeping, brain fog, irritability, neck stiffness/soreness, fatigue, and occasionally GI issues. The big symptom that tells me a migraine is imminent is difficulty speaking (the words come out, it just takes longer) and a weird sensation in my sinuses.

I have other symptoms (e.g., photophobia and audiophobia) during the migraine, but by the time those pop up, I already have pain.