Not getting the support from fiance

It might be my hormones but I'm so emotional that my finace is anything but happy and excited, the opposite actually. We found out I am 5weeks pregnant yesterday. Keep in mind we already have a daughter who is only 14months. He just keeps " saying I'm just shocked, it wasnt supposed to happen."... This pregnancy wasnt planned but then again his pull out game is weak. I told him "I didnt make this baby alone" and now we are just arguing. I need some thoughts I'm just so upset now... I am so excited and happy about this new baby.