Could morning sickness at 16weeks be described as just a random and sudden urge to gag or throw up?…

Could morning sickness at 16weeks be described as just a random and sudden urge to gag or throw up? I don't feel sick or upset in my stomach at all but the past week I'll just suddenly have to gag or start dry heaving for absolutely no reason. It's not triggered by smells. Also need opinions about those convertible car seat/nursing covers you can buy on Amazon made of that stretchy fabric. Looking for something dual purpose this time since the cover I had with Henry was hard to carry around and served little purpose and took up a lot of space since it was huge. We also had a car seat cover with Henry too and used it but it tended to try to flap all over the place so maybe something that stretches over it would work better?