Yeah I'm normally 27 days and this is my first month where I'm late also.
If you are unsure of PCOS then I would get your doctor to order tests or an ultrasound to check for you. You are normally 27 days right? Is this your first month where you are late? Some women do have an "off" cycle here and there. I had a cycle that lasted about that long too. Wait a few days and test again...if not, you could talk to your doctor.