thank you for your query.
IF the blood and urine pregnancy
tests are negative, you are not pregnant.
Also you mention that you are having regular periods, so i wonder why you are still obsessed with the idea !
What you describe sounds like gaseous distension and flatulence
The swelling could be because of hypertension
or renal causes or some kind of allergy
Breathless ness is also not normal.
Try having a bland, non spicy diet, small frequent meals.
Avoid binge eating
and oily, spicy, greasy, heavy meals.
Please consult a Physician once more if the symptoms do not subside.
Please forget about the pregnancy for the time being.