The presence of two distinct red lines of the same width, one in the test region(T) and one in the control region (C), means you are probably pregnant. One line may be lighter than the other; they do not have to match.
The presence of one red line in the control region (C) means you are probably not pregnant.
The result is invalid if no red line appears in the control region (C), even if a line appears in the test region (T). You should repeat the test with a new test strip.