Am I prego?

So my boyfriend and I have had unprotected sex and I’m on the pill I been feeling a bit different lately so I took a pregnancy test and it was negative, but I was trying to get hat test out of my house without anyone seeing it or freaking anyone out cause I mean it was negative but I left in my car in a bag so I could throw it away (yes sounds disgusting) but anyways I left there overnight and it’s pretty cold here in Utah but I had totally forgot about the test so I threw t away two days later it had been sitting in my car but when I looked at it, it showed positive. Did the temp. Have something to do with the results I’m sorta freaking out cause idk if I am or not.