hi, i dont think you are pregnant as you have done a home pregnancy
test and it was negative, from your symptoms it seems more like hyperacidity
issues which could have been brought about by eating certain types of foods, about your periods behaving like that, i would suggest wait for another month and if you get the same pattern then we need to investigate, the bloating
also could be due to just hormonal
imbalance would advise you see a gynecologist .
hope have helped to answer your query.