For examples what causes pregnant women to vomit,smell things better, sleep more, and etc. If you know what causes any type of pregnancy symptoms,please give information. thanks for answers.
its the special hormones your body is now producing.
There are a number of signs and symptoms to watch for. Chances are you will only experience a portion of the symptoms. Each pregnancy is different, and the same mom to be can experience different<!–pregnancy signs each time she gets pregnant. If you temperature remains high for fifteen or more days after ovulation, you may be pregnant.
areyoupregnant.awardspace.com/pregnancysymptoms.htm
Pregnancy symptoms can begin for some mothers immediately after conception. Some pregnancy signs require that you chart your cycle, noting your daily basal body temperature.the next and best sign that you are pregnant is a positive–>pregnancy test. Home pregnancy tests measure the pregnancy hormone hCG in your urine. and also, one of the most common pregnancy signs is a missed period.
Hormones are the most likely culprit for the majority of early pregnancy symptoms. Added to that, the intestines move out of the way to make room for your growing uterus.
Besides the fact that hormones cause all kinds of stuff, I knew that smelling things better was a form of protection for your baby when you're pregnant because you become able to know if something's gone bad before a non-pregnant person. I don't have the source for this information,I must have heard it on tv a long time ago, but it definitely makes sense! 
Hormones, the levels of the hormones and the way your body is adjusting to them.