for second time mums: any difference in morning sickness with your two pregnancies?

1st one: all day sickness but only vomit at night. vomit around 5 times during 1st tri. all day sickness stopped around 16 weeks 2nd one: all day sickness but vomit anytime of the day. can vomit 1 to 2 times a day. 18 weeks still vomit