My daughter is having sex with my husband?

she has sex every night with my husband ( her stepdad ) i have long since tried to contain her but this is going to far. they have even had sex next to me in the same bed. they do not try and conceal it. Ray my husband said if he would lock me up if i did or told any one. i am sure he has a gun. My daughter does not take me seriously and makes fun of the fact that she sleeps with my husband. I am afraid as i am pregnant with Rays child.