Yes I went through this with my second pregnancy with my daughter, I felt so lonely and sad and I started feeling like no one in my life liked me anymore, which wasn't true at all, it was like a battle in my head between these sad emotions and my rational brain, I felt like I was going crazy.. I recommend trying to find some other pregnant moms to hangout with, finding mom friends has helped me so much, also if you start feeling down try watching something funny, listening to up beat music, take a walk, or do yoga, movement releases happy hormones
i was the exact same, i cried about 3 times a day because i jsut felt so alone (still do) pop me a message if you ever want to talk, i know exactly how it feels❤️