Open My Orders in the AliExpress app or website, tap the order, then Track Order / Logistics. The number appears once the seller ships โ not when you pay.
The most common worry is a parcel that shows nothing for a week or two. That gap is almost always the international leg: it is scanned when it leaves China and again when it lands, with little in between. Silence is not the same as lost.
Every order carries a Buyer Protection period, shown on the order itself. If the deadline is approaching and the parcel has not arrived, open a dispute before it expires โ you can always close it if the parcel turns up.