so confused

Okay so I had an unrelated pelvic scan on Monday and the sonographer thought she saw a very small yolk sac, she called another sonographer for a second opinion and she said cyst in womb?! Saw my fertility specialist that afternoon for test results and I asked him to view the scan images and get his opinion, he did and said it looks like a very small yolk sac and sent me for hcg test, it couldn't be more negative... Less than 1! 😭 Now gotta wait for af, not due til 10th... He said could still be early pregnancy but too early for hcg (apparently you can pick up yolk sac very early) who knew! I am not in any way shape or form getting my hopes up! I just think it would be far too soon for blood test or yolk sac! I don't know when I ovulated this month as I got sick of trying every month and stopped testing 2 month ago. Itll be a long wait but we shall see, either way I'm worried as there is something in my womb wish me luck please ladies xxx