Burps taste like burnt popcorn?

Marli • Lottie Mae norm 3-23-20. Liam Thomas🌈 born 4-7-17. Angel baby 5-4-16. Hubby & I married 11-1-14. Have two Pomeranian `babies`.
10+1 and haven't eaten popcorn in weeks. Yet tonight I'm nauseous (per usual) and burping. And every time it tastes like burnt popcorn. 
Is this just One of those weird pregnancy mysteries?
Anyone else had this?
Is it a sign of anything?
Thanks!