Phone sex

Okay you guys so my mom heard my boyfriend moan because we were having phone sex but I wasn’t moaning it was just him. She called me and told me she heard a man on the phone being loud like masturbating and I panicked that I said it was a movie playing in the background. Honestly I don’t know what to do I’m scared she’ll approach me. I’m 19 and I still live w my parents but I work not that that matters the thing is I’m scared. And even my bf said to use a movie as an excuse ??. Thoughts? Sorry I’m anxious also my mom it’s very old fashioned so this is taboo to her idk update:: so we talked and the thing is she can’t let me grow up she’s too scared to face it /: idk