Pregnancy

Everyday there's a nagging feeling in my stomach and it makes me very uncomfortable, unfourtunatly. I am about 7 weeks pregnant and I cant wait to have the baby. There are alot of things that I dont know about being pregnant, because it's my first time. Please some things that I should expect @ or at least why am i gaing so much weight early on. What should I do, or what am I doing so wrong. What can I do to eliminate some sickness. Please shed some enlightment.