My stomach is bloated.i had last sex in 14th febuary 2015 n i took a pregnancy test on 14th march,it came negative,no spotting,no cramps only bloating?

Abdominal bloating: There are lots of reasons for abdominal bloating, & not all of them are due to the GI tract or pregnancy. Even "functional" syndromes may be present without underlying "disease." However PSBO (paralyzed gut) due to metabolic & inflammatory conditions nearby (like an untreated infection of the urinary tract) must be considered & addressed. Check with your doctor for examination & treatment options.