Early sign of pregnancy?

I have been burping almost non stop. I am super bloated (pretty sure that’s the cause of the burping) diarrhea, and now I’m nauseous, and vomiting. My period is due in a day. But it’s irregular. We are TTC our second baby. I was super nauseous in my first. But the belching has me concerned... anyone else seen or had any of this so early in pregnancy?