Think that is common that you go a bit more as you near labor.
And as mentioned, had a lot of
nausea and heartburn in my third trimester
and in particular the last month. You have a long way to go still. And this was an 'episode'. So, just monitor it. If you get anything like severe back pain, then worry more or if you start to cramp. But I think you are probably fine and baby is safe and snug.