Don’t know what to do ?!

Hello,

I’m 18 weeks pregnant and I’ve been with my boyfriend for 6 years., we currently live with my parents as were saving to buy a house.. we had an argument 4 days ago and I haven’t seen him since., no messages no calls no nothing. I presume he’s gone back to his parents house.. we don’t fight regularly but I can’t help but feel so lonely! I’ve tried to ring and text and tell him how I feel but it seems he doesn’t care for me or our son.. I have a hospital appointment Wednesday it will be my first time meeting my doctor and I’m so tired of being let down and on my own. I do everything for him he would be a different person if it wasn’t for me.. i thought he wanted a family he even bought me an engagement ring for Valentine’s Day but I don’t understand why he’s doing this now.. I feel so lonely with nobody to talk too. I try not to be upset for my baby’s sake cause I don’t want to cause him stress. Help 😫