These are how the Fortel brand work

There is 5 in a packet you can test between 10am and 8pm each day (i used to do mine around 3) and you only use 1 a day, but once you pick a time to use them then you continue to use them at the same time each day. if there is only 1 line on the test it is a negative. If there is a faint 2nd lind it is a negative. If you get a 2nd line that is the same as or stronger than the control line, that is your positive and they recommend to start DTD within 24-48 hrs. When I got a positive I would DTD that night and again the next.

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