Last Night I had another Lucid dream....But I notice it usually comes randomly instead of something I can control

So I decide to use dream signs to see if this can fix it but my dreams signs are particularly all over the place. Meaning I think they change. I usually reach Lucidity by the time I reach my 3rd or last dream, But I wish to do it via first dream, But my dream sign is confusing.

At first it was usually have 2 or more girls around that are like the central plot of the dream, then the sign use to be something out of the logical thought happening, now it's if I have more then 2 dreams.

How can I recognize them often? Sorry if it's a stupid question