Im from michigan, were it gets cold, was thinking about buying some, to go, ones and leave them in the car, just as incase thing… My question is does cold weather affect the pheromones and would it be alright if it was left outside in cold weather also?
Cold, no problem - pheros are tough!
Extreme heat can be damaging but that is in only the most scorching conditions - like on your dash in highest summer. More likely the more volatile scent/solvent components will be done-for first, long before the pheros themselves.
Wearing pheros in cold conditions can be difficult - the diffusion falls-off rapidly as it gets cold and by about 4c there isn’t much - Below freezing its virtually nonexistent. Look to making the best use of warm indoor space at these times - The extra humidity of warm/muggy indoors in winter can actually help diffusion to an extent. 
Oh I meant by, keeping them in my glove box and in case I’m no where close to home I could spray a couple on me and go inside where ever I am and everything would be fine with them, I never thought about spraying them and staying out in the cold lol
Does this applies to oils?
Oils are a bit more resilient - they also diffuse better/longer as it gets hot and won’t break down or evaporate in the same way as sprays but yes, its broadly the same - Except that when wearing them in very cold conditions, the diffusion falls-off quite a bit more sharply as it cools. Sprays are better if you are about in these conditions.