At what level is low BP urgent? Mine is usually 115-120/70-75, I've checked it a few times and the latest one was 69/47. Heart rate is normal at 85.

Check your device. The reading of 69 is too low, of course. If you checked it yourself, your technique could be wrong. It could also be a problem with your blood pressure machine. If it really was 69, you should follow up with a physician.
When symptomatic. Blood pressure is a problem when there is not enough pressure to perfuse your organs including your brain. Generally a pressure of 69/47 is inadequate to keep your brain awake and should result in loss of consciousness. I think it is mistaken. The other BP seem reasonable.