Hyperemesis Gravidarum rarely ends at 12 weeks of pregnancy. It typically improves in the middle of pregnancy, but symptoms often last until birth. 

"The support I received over the past 6 weeks helped get me through what has been the toughest time of my life. Having someone who really who really understood the condition give advice helped us through and crucially, at times, gave me really useful information I didn't get from my own medical practitioners. In my experience, HG is such a debilitating and lonely struggle, the more support you get the better chance you have of surviving it" - Lisa, from London.