Strange number

I saw my husband made a call to a strange number and the call lasted about 23sec. The call was made when my baby and I were not at home. When I googled the number I saw it belongs to a website for prostitution. He kept denying that he made the call and he did not know what happened. Later, he claimed that he might have accidentally pressed it due to video ad. He claimed that he had been home during the entire day. Should I believe? #pleasehelp