posts and sites

Hi. Im very confused.
I made a website and paid to change the domain name only.. I was able to post and edit under the new domain/web but thepast week or so I have had trouble.. if I go to my domain I can click on the ‘pen’ symbol at the top and write a post but when I publish it it doesnt show up on my .com site but does show on the wordpress.com site?

It wasnt doing this before so I dont know whats happening. I hopei havent lost all of my work!
Please help