What the heck?? So confused!!

My cousin told me this morning that she thinks she's pregnant.. Like she said she just feels pregnant and feels like she is. She's going in for a blood test tomorrow. Weird thing is?? She said she hasn't had sex since August/September so she would be around 33 weeks if she was?? She said even though she's getting NEGATIVE HPTs AND STILL GETS A PERIOD EVERY MONTH SHE STILL THINKS SHES PREGNANT. Like I'm sorry I just can't believe her until the doc can prove it.. She has a long torso and is super thin and barely has a belly... I just had to rant to someone lol