Pelvic scan tomorrow - scared cervical or ovarian cancer

I have a pelvic ultrasound tomorrow and I'm absolutely terrified.

I've had constant lower back pain for about 10 weeks now and pain in my left leg, like a dull ache that doesn't go away, also sciatica type pain in my bum.

About 10 days ago I noticed pain on the left side of my abdomen which feels like it might be an ovarian cyst or something.

I've recently been diagnosed with vitamin d and b12 deficiency and I'm terrified that they might be connected to all my gynae issues.

Has anyone else had similar experience? I can't get the worst case scenario out of my head.