We had our tub and toilets back up a few weeks ago. The plumber came out and said the pipe was being blocked by the tree roots. He snaked it out as best he could, but said we'd need to have a camera take a look at the damage. In the meantime the roots can grow back and cause problems again.
Last night I couldn't even stand by the kitchen sink because the garbage disposal smelled so bad. Bruce thinks it's the plumbing again. Yesterday I was doing laundry and cleaning the bathroom. Plus he was working out in the garage. We just had a lot of water going all at the same time.
So I'm thinking maybe it is the sewer line is becoming blocked. You'll want that looked at before it's too late, like it was for us. That was a horrible night for me (I get up several times during the night to go potty).
You should definitely figure out who would be responsible for that and get it checked SOON.