Me and my fiancee need help?

me and my boyfriend been goin at it for awhile and i found out i was pregnant..before i could tell him i was pregnant he asked me to marry him so i was excited so after i said yea..at least 2 hours after that i fainted but once i sat down and got somethin to drink i felt better..i just recently told him about th baby he was so excited that he forgot and was spinnin me around..but him and his parents dnt get alone and his dad loves me like im his girlfriend and he mad cause im with his son and having a baby and he is always doin stuff so i cant have the baby like movin to fast so i would trip or bumpin into me real hard or rub my stomach and press down on it. my fiancee pulled a gun out on him and threated him now he send threatin notes to me about me and the baby should me and my fiancee handle it ourselves or what plz i need help..