Sleeping on stomach

I sleep on my stomach, well kind of. You know how you sleep on your stomach with one leg out? That's how I sleep. Anyways, I'm 22 weeks and I was wondering if it's okay, baby moves a lot and I hear his heart beat every two weeks so I know he is okay. I am really big though, I weighed 287 at my appointment today. I just want to be sure I'm not doing anything wrong. Does anyone else still sleep like this?