Is my plant starting to flower? I have it on a 20/...

It appears as though it is starting to flower. The light cycle does not always affect the flowering period. In the case of auto-flowering plants it is more of a time release situation in which the plant typically grows for at least 4 weeks and then will make the switch to flower on its own. Auto flowers occur when an Indica or sativa plant are mixed/bred with a ruderalis Plant. The ruderalis breed doesn’t flower based on the light cycle but by how old the plant itself is. Hope this helped and good luck!