HPTs are not usually wrong 23 days after a missed period. (I hope you aren't disappointed to hear this.) If you want to be sure, either wait until your next missed period and test again, or go to your doc and get a pregnancy blood test.
Usually, you should have a positive now like Anniebrooke said, I'd call your doc. and get a blood test done. It could be that you are starting the change. My neighbor is just a year older than you and has been going through it for about 2 years now. Best of luck
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