Pregnant with depression

I’m about 6 weeks pregnant. I have moderate depression I just got it down to moderate after it’s been severe for a while. I’m struggling to not over think and get stressed and sad. Being pregnant has just made it even worse to be okay. I’m happy I’m pregnant but I worry a lot something bad will happen. Thinking so negatively has been a struggle. I feel so alone and I can’t sleep sometimes because I want to cry and I wish I could sleep but I feel so guilty because I should be happy I’m blessed to be in my position. It’s just so hard I wish I had friends but I’ve always been so introverted I don’t have many I can go to. I’m only 19 I’ll be 20 next month and I never thought I’d live past 18. I just wish I didn’t feel so alone all the time