Hi Lizzy--it's my privilege to help you!
Based on the timings, I very much DOUBT you're pregnant (less than 10% chance, but NOT impossible; in fact, if no menses by next tuesday--DO a preg test).
Based on all the info you gave, there are 2 Hi-probability Diagnoses:
1. Gastritis (most likely): Literally, means "inflammation of the stomach" [explains your symptoms]; here's a free link to more details:
http://digestive.niddk.nih.gov/ddiseases/pubs/gastritis/index.htm (this lists the CAUSES of gastritis, and what tests need to be done to confirm it--ask your MD about the tests).
How to self-treat gastritis, initially?:
-Buy OTC Zantac 75mg (any drugstore): take 1 tab 2x/day; this will start healing the gastric inflamm.; NEXT: take Mylicon Antigas Tabs--2 tabs JUST before each meal.
-Also: stick to a Bland diet (No spices; caffeine; alcohol; acidic foods; greasy foods)
-IF sx don't improve signif. within 5-7 days, SEE YOUR MD for Dx tests and/or stronger RX meds.
2. Irritable bowel syndrome [IBS]--less likely ; here's a public link:
http://digestive.niddk.nih.gov/ddiseases/pubs/ibs_ez/ (everything here is pretty self-explanatory; but I would bet my money that you have GASTRITIS, not IBS)
I hope you found this to be helpful-IF SO, please hit **ACCEPT** as you read this Answer, so that I will be credited for my time. THANKS !
Best wishes for speedy recovery Lizzy!
--Dr. Steve
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Info given herein is general health info, and NOT a substitute for needed M.D. attn