I bought 3 tests a few days ago and decided to leave them in the car. No biggie right? Well I live in a very cold area right now and it’s been below freezing since I’ve had them. I Happened to look at the boxes today and they say not to freeze and to not store them under 30sum degrees...so my question is, are they still useable? Can I trust the results? Walmart brand cheapies in case that helps. Thanks!