As you may have heard, women who have morning sickness have a statistically lower risk of miscarriage. With that in mind, it's easy to start worrying that it's a bad sign if you have no nausea or vomiting.
However, lack of morning sickness is not considered a symptom of miscarriage. Although many women do have nausea and/or vomiting during pregnancy, many others have perfectly healthy pregnancies without any nausea at any point. In addition, it is not unusual for morning sickness to come and go, so fading morning sickness is not necessarily a sign of miscarriage either.
Thus, you should try not to over-analyze your pregnancy symptoms. Fluctuations in pregnancy symptoms are normal and there is a huge variation among women. But if you are worried because you're having symptoms of miscarriage, or if you continue to feel nervous, talk to your doctor to see if there's any way you can check that everything is alright so that you can feel reassured and relaxed.
Sources:
Furneaux, Edwina, Alison Langley-Evans, and Simon C. Langley-Evans, "Nausea and vomiting of pregnancy: Endocrine basis and contribution to pregnancy outcome." Obstetrical & Gynecological Survey 2001. Accessed 21 Nov 2008.
Weigel, Ronald M. and M. Margaret Weigel, "Nausea and vomiting of early pregnancy and pregnancy outcome. A meta-analytical review." BJOG 1989. Accessed 21 Nov 2008.
