Have you made it seem like the babies are more important or will be loved over your husband? Psychologists will agree that the love of a child and the love of a spouse should be different and the spouse should never be 2nd to the children. If you've hinted to this or he feels this way, then you upset him greatly. He may feel like his relationship with you is in jeopardy or will be lowered in value when the children come. Children should draw a couple closer together not push them apart.
You definitely need to talk with him.
Being nearly 8mo pregnant myself, I DO NOT recommend you practicing any rituals at all! The energy of a ritual can be intense and that isn't good for us or baby/(babies in your case). If you feel you must do something spiritual, prayer and a suitable offering to the right spirit/deity can help bring clarity to the situation and maybe offer a solution. Meditation is wonderful during pregnancy and it can help you to receive insight, inspiration, etc.