Pregnant or something else

Ive been feeling very strange this past week. Not so much pms but off. Confused, forgetful, sometimes just plain stupid. I smelled gasoline at the nail salon 3 days ago and felt like i was going nuts. Today i have such a headache and my lower back is still aching. Im supposed to get my period today but still on hold i guess.

I have pcos so idk what this could be. My period has been relatively predictable the last 5 months. Im too nervous to take a test so early. I cant go to a dr until jan when my insurance kicks in. Any help will be useful. Of course i want to be preggos but i want to be realistic and not get my hopes up too high.

Thank you. And happy holidays everyone!