i havnt used etrade but try look for a section called 'market depth' this shows you the outstanding buys and sells, listed by price first . ie for buys the highest price is on top and lowest price on top for sells. with orders at the same price, whoever placed the order first is first in que . so after u place an order, look at the market depth and look for a quantity (of underlying security) that matched the order you put in and you can work out the order depending how far away from the top of list you are .
note that if your order price is too low compare to the other outstanding orders, it may be really deep down the list in which case some platforms dont show .
hope this helps