My husband has two kids with his x

My husband has two kids with his x wife, at beginning he took all efforts to marry me, told me they would visit once in two weeks and i accepted for it and trusted his words, got married. Itseems like he n his x take decisions and i got to adjust with their timetable.impromto pick ups, impromptu home stay n I need to cook for them.now im in my 8month pregnancy and when I ask him why didt you tell me that they are extending the stay, he is replying like "o meet them once in 2weeks they don't come often and portraying in a way that im not letting him to meet them." But in reality he is meeting them every week. I feel so trapped and cheated in this marriage. Please suggest me with advice. I'm scared about my future and my baby's future. This is my first pregnancy and I don't see any excitement from his side as he already hav two kids.im missing out all the memories and im scared if my son would be happy in this life and he being his father. I have multiple doubts if he can take care of my son.