Thank you for the query. The vomiting
feeling is natural in first 3 months of the pregnancy
. But if you are also thirsty and urinating a lot then you should never wait till 24th week to check your sugars. In fact as per recent recommendations, you should be checking your sugars by oral glucose tolerance test
test as soon as you get to know that you are pregnant. So go ahead and do the test.
Secondly if the sugars are high then vomiting sensation can also be part of its manifestation and not only that of the first days of pregnancy. So do not wait and get it checked. All the best.