Go see the pharmacist you usually pick you prescriptions up from and ask if they will do an emergency prescription. If they know you and know that you are usually picking up insulin, needles and test strips they probably will give you a box of test strips to see you through the weekend.
If not, you'll just have to buy some strips. If the chemist has some in stock they can just sell them to you over the counter. If they don't have any in stock you can ask if they would phone other chemists near by to see if they do. Or you can do an Amazon prime order for a quick delivery.