Nausea when implantation occurs?

Kaye
I woke up last night with the worst nausea. I hardly slept and I'm still getting waves of it. I might just be sick, like with a stomach flu, but did anybody get nauseous when implantation occurred? Or in that TWW period at all? It's awful nausea, but it might be more bearable if I knew it was for a good reason!