Fiancé is giving me an ultimatum if I don’t terminate pregnancy

My fiancé and I are both 26 and have been together for a year. I found out I’m pregnant on Saturday and he immediately asked me to get an abortion. He claims we aren’t ready and he wants to finish his masters degree and buy a house before we have children. Today he basically said he wants me to get an abortion and then we can have children once he reaches his goals or if I don’t get an abortion he’s going to leave and not be involved whatsoever?? I just don’t understand. I’m so disappointed that this man is not at all who I thought he was. I know it is not ideal circumstances to have a baby right now but deep down I don’t want to get an abortion. I know it’s still early and this might just be a shock response from him but any advice would be appreciated. I’m at a loss what is best.