I just have a question...

So I was wondering if anyone has ever got a neg at 11 dpo but took a test a day before there period was supposed to start and got a positive? It hasnt happened to me yet but I was curious if anyone has experienced this?. Everyone knows I got a faint positive at 9 dpo but everyday since its been neg. Today I couldnt stop crying pver everything I was crying. I have also been really mad? I just ate a bowl of cereal something I eat all the time and thats a nope as well I wanted to vomit everywhere... Is it just to early for me to test??