Im so lost for words!!!

Been in a relationship for 2yrs. I've been loyal to my boyfriend even tho he hasn't. Took him back after everything. I saw the difference in him. He changed so I thought. I just found out we are expecting. I was nervous telling him but I did. I have a 19 yr old child already. And after being married ive had 4 miscarriages. So this pregnancy is a blessing. But the thing is he said he would stand by me.. Now that I told him I have my first Dr appointment it changed him. Now he doesn't want anything to do with the baby. I'm already hi risk and I'm scared and for him not to support me. I'm a mess. He didn't come home last night I haven't slept and been crying all night. I don't know what to do. I raised my child as a single mother. And now I'm at it again. I can't with this pain in my heart.