5 days away from AF

Kaylee
Hello ladies. I've been having every early sign of pregnancy for the last week and a half now. I got one of those early response tests that say they can test 5 days sooner than your missed period. My cousin turns 21 on the 26th, I'm supposed to start on the 27th..she's been asking me everyday if I'm going out with her and I don't want anyone knowing I might be pregnant until we tell our parents first so of course I can't tell her why I may not be able to go out.. Do you think I will get lucky and get a result early? 
Also my mom had her period the first 3 months she was pregnant with me, so I feel like I can't go by a missed period. /: Any advice would be helpful. I'm not much of a drinker as it is, I just know she will be asking questions and I don't want anyone knowing yet!