Struggling with life/work/money

I'm almost 21, I have an almost 3 year old, pregnant with my 2nd, and will be getting married next month. That part of my life, I absolutely looove!! I just found out I'm pregnant after a year of trying amd finding out about some fertility issues, so I'm so happy about that. My fiance is amazing and so awesome. However I'm just struggling with everything else. A few weeks ago, I quit my full time job as a correctional officer. I worked 11:30pm to 3:30pm 5 days a week. So about 80 hours a week. I never got to see my son or fiance, take care of myself, or my farm animals. I was also treated badly there by other staff due to stereotypes about female COs. I absolutely loved what I did though. I was good at my job, it have me confidence, and made me feel like I had a purpose. However, it incredibly affected my mental health and I was exhausted so I had to quit. I unfortunately quit without having a full time job lined up(big mistake, but was desperate to get out of there.) A couple days later tho, I accepted a security job at some apartments downtown working 10pm to 3am 3 nights a week. I thought it would be easy. However, what they didn't tell me when I got hired on is that I have to walk around back alleys at all hours of the night making sure there's no homeless ppl back there and it's a very scary part of out downtown. I do carry, but I still worry about my safety with being pregnant. Not only that, but this job was a huge pay cut and now I'm stuck helping my fiance make ends meet. I figured I would work this job until I found something else. I'm on indeed literally every single day applying to everything and I keep getting emails back saying they moved on with another applicant. I have awesome experience with a lot of different things, a professional resume, and great references, I don't understand why it's so hard to find another job. I'm just so stressed out bc I need to be making more money asap, especially with a wedding next month, a baby due in 6 months, a car payment, etc. I just feel like I'm totally failing at this and I'm not happy. I just need some positive thoughts