I don’t know what’s happening to me

Hi, I’m 25 years old. I’ve been having irregular periods since I was 12. For the past 21 days, I’ve been bleeding and the flow has varied within that time frame. I also have been experiencing some symptoms that I have never experienced before like fatigue, dizziness, nausea, stomach and back pain, constipation, migraines, pelvic pain, very high sex drive, hot flashes and mild mood swings.

Now, I have gone to the doctor and I have to do a bunch of tests. She thinks I’m pregnant but I feel like this might be PCOS. Anyway, she won’t give me anything until I get the results. I’m scared because she also said that she also needs to do a biopsy My grandma died of ovarian/uterine cancer at 33 years old and my mom had fibroids and endometriosis. Idk what to do. I can’t talk to my best friend about this.