Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
No its not likely that you are pregnant. The symptoms that you are having are not specific for pregnancy
and can occur with acidity as well. You may take some anti acids which will help in calming down your acids in stomach. Ranitidine
is a good drug for the same. the symptoms can come down with it.
Urine pregnancy test is a fair enough test to diagnose pregnancy and if it is coming negative, then you are not pregnant.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, or wish to know further about this problem, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.