30 Weeks and randomly throwing up?

I had horrible morning sickness with this pregnancy from 4W until about 19W. I’ve been FINE since then. Not only no vomiting, but no real nausea to speak of. This morning I woke up and felt okay. Then as I was talking to my mom, I randomly felt like throwing up. I almost didn’t make it and I threw up so hard I blew out a bunch of blood vessels in my face. Is this normal? Is this a sign that labors coming? With my daughter I threw up right before so I’m worried.