Ovarian cancer

Hi, 

I'm new here and just wondering if anyone can give me some advice or maybe put my mind at ease. 

Ive just turned 29 never had children and overweight.

I've recently had a lot of symptoms of.... Cramps in stomach like period pains, mainly on the left side, sometimes get sharper pains and these cramps have been everyday for the last few weeks. 

Mild lower back pains, always bloated, even when I wake I feel like I've eaten a horse and lower belly feels hard to touch. Ive also had to stop having sex as i get really sharp painful pains on the left of abdomen. I've had two periods within 3 weeks but not my usual period, was mainly spotting or just brown mucus.

I've been to the doctors and he didn't really say much other than he booked me and ultrasound on my ovaries but it's not until the 9th of march and I'm constantly thinking that it's cancer but I've heard that it's extremely rare to have ovarian cancer at my age?

Any advice or similar stories would be great 

Thanks

Kate x