Help with preseed?!

Weve used this stuff for a month AF still showed so are we using this all wrong? I used the applicator and we just went right to it.. i read that youre suppose to actually insert preseed then wait 15 mins before actually doing the deed for best results? Then i read fro m someone else on here that you cant wait or its not going to work right.. guys can someone please tell me what we are doing wrong? I was pretty sad this wasnt our month because i was so sure it was. Anyways any help tips or tricks would be great thanks in advance.