Hello,
Thank you for asking your query.
I discussed your concern with our team OBGYN. Modern Urine pregnancy tests are based on urine HCG levels and hence have good specificity. That means most likely you are Pregnant. The symptoms are also suggestive of pregnancy. Any other cause is unlikely.
If you wish to carry on with the pregnancy you should take a Folic Acid tablet once a day. Avoid alcohol and other medications. And do get in touch with your Doctor for confirmation tests.
Hope this helps
All the best
Please feel free to ask followup questions
Thank you