A few cents can cover the entire hoped-for gain once scalping trading costs are included. After crossing the spread and paying commissions, there may be little left; an unfavorable fill can reduce it further. For trades held briefly, these amounts deserve attention alongside the chart setup. Start with the actual entry and exit prices, the quantity traded, and the charges on the statement. That gives the result of a completed trade. Keep the original quotes nearby when reviewing execution, so the prices received can be compared with the prices available when ordering. Otherwise, an expense already reflected in a fill can end up being deducted again.
