Research on HG's short- and long-term effects is desperately needed and needed now. We need to do more to find a cure for this disease that has such devastating effects on a growing number of soon-to-be mothers.
Signs & Symptoms
Your symptoms will usually begin around week 4-6 and peak between 9-13 weeks. However, they may start before the pregnancy is confirmed by a pregnancy test. Some women feel changes within days of conception. If onset is later than the first trimester, you do not have HG. Rather, you may need to have your liver and gall bladder function checked, or it may just be the physical changes of pregnancy. There are many other conditions that can cause similar symptoms.
Typically,
you will find symptoms end or at least improve significantly
somewhere around 14-20 weeks, however, some
women (10-20% or more) continue to have symptoms for their
entire pregnancy. Occasionally, a woman will have a worsening
or return of symptoms later in pregnancy. This is uncommon
if you have had several weeks without any nausea/vomiting.
Symptoms may increase and decrease throughout pregnancy
and as long as you feel any nausea, go very slowly when trying
to go off of (wean) a medication. Unfortunately, HG often
recurs and follows similar patterns in future pregnancies,
though severity may vary each time. See the Merck
Manuals
for more information on the below conditions:
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Common symptoms you may notice and should mention to your obstetrician:
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Signs & Symptoms your health professional may note:
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** Report this to your health professional immediately
Updated on: Mar. 24, 2010
Beyond Morning Sickness 
The Proving Grounds