My boyfriend says every time after we have sex, his stomach feels bloated and growling, and he is convinced I am giving him an STD. I have gone to get tested 4 times in the last 2 months & my tests come back negative for everything. He says after we ve slept together, he has gone to the local clinic where he lives & got a shot in the buttocks & antibiotics and it went away, but he never went back for his results. He refuses to have sex with me even though my results are negative (x4). I am also pregnant, and tried to tell him it may be male symptomatic symptoms. Is there an STD that causes bloating and growling stomach, why would I be testing negative, and what should I tell him to get him to believe me I m not giving him an STD?