Hello, I Am A 19 Year-old Male. I Am Concerned/confused

Hello, I am a 19 year-old male. I am concerned/confused if my ex-girlfriend is pregnant. I would say she is around 6 weeks late on her period and has had irregulars before. I gave her a test about 4 weeks ago and it came out negative. She hasn't had any symptoms of pregnancy other than recently frequent urination. I am really worried right now