I had a ultrasound done

So I got one done because I've been having really bad stomach cramps and as far as i know I'm not pregnant. She did a ton of measuring the appointments are only usually 5-10 mins at most but this time it was almost 20 mins. Kinda got me nervous but I think it could just be cysts she was measuring. I got a few sneak peek pics when she left the room to grab something to me it looks fine but on the very bottom on the right theres this weird shadow looking thing on the top of my uterus.

Anyone know what that could be? I get the results on Wednesday but kinda bored and want to know.