Firstly, did you originally check the level without running the engine following the oil change? If so...the drop may be from filling the oil filter housing once it did get started. But being at the bottom wouldn't trigger a CEL with an oil pressure icon/code.
Oil consumption; Oil could be pooling in the fmic and boost plumbing for now, but at WOT you may see some smoke. If not smoking daily while driving tamely, the leak is likely not from the valve train going directly into combustion. This means you may have a busted valve cover-internal splash plate that seals the evap and pcv reroute to the turbo inlet... or it could be a leaking turbo seal.
