Hi. Welcome to the forum.
First and foremost, when in doubt - Always see your doctor.
Second, Take a EPT or HPT, even though they might be negative does not mean your not.
http://www.babyfit.com/register.asp
Check out the following sites, they will help you through this a little more to reassure if you are.
http://www.mayoclinic.com/health/sym...gnancy/PR00102 scroll down and even get answers on exercise, dangers, etc.
http://www.epigee.org/pregnancy/symptoms.html
www.askdramy.com The U.K. online doctor.you can post on a forum, or 'ask the Dr. Amy' with a click. The FAQ Tab on the homepage is also a good place to click and has a lot of good subject matter. P.S. Most of the articles are printable in PDF format.
Good luck, and keep us posted.
http://www.babyhopes.com/articles/getting-pregnant.html

Happy New Year!