Opinions needed

Jessica

I had a scan last weekend because of constant spotting and cramping. All was fine with the baby I got to see the heart beat. No explanation was given about the spotting and cramping. Anyways I sent the picture of my scan to my sister and she asked me what the dark bit was... does anyone have any ideas? Is it something I should be worried about?

Its been over a week since the scan and I'm still spotting and having cramps