Confused

My fiance and I have been together for almost 12 years we have 2 kids together and have had our ups and downs alot lately he has been so confusing to me one minute he says absolutely no more kids and then the next he says maybe some day and now I am almost 5 weeks and he got so upset saying he dont want no more kids and he would do anything else I want but he dont want this. I dont have anyone to talk to and I just dont know what to do I feel that ko matter what choice I make it will ruin us