Is he not attracted to me anymore ?

I came home from work today and found a male butt plug in the shower. I questioned it, I know we have many toys but he constantly tells me he doesn't masturbate. I'm 7 months pregnant and extremely insecure. He was outside the whole time i was home, and I leave for work and he's using toys. Could he be cheating on me, does he use anal sex toys without me. I asked him why it was in the shower. He says he was mastubrating and used it. Alone.