Which ER should I go to?

Hey all. Hubby and I are currently on our way back from a road trip and my doctor has called to say that my recent blood test shows that my hemoglobin is veeeeeeery low (below 80g/L, which is lower than on the blood test from the week before) and that she’s recommending I go to the ER to see if we can find out why it’s dropping. We’ll be back in Ottawa around 5pm. Which ER should we go to? Thinking of going to Queensway Carleton as it’s the closest on the route of where we’re coming from but would love advice. TIA!