Depressed

I am a mother of 4. My youngest is 7 months old. I stopped working and been spending time at home with baby but my husband is struggling with bills so it's time for me to return to the work field. Before I returned I was gonna get my tubes tide because I was so sure I was done and everyone always has something say about how we have too many kids and we are struggling because of it (so annoying). But when I went for my apt I found out I was pregnant again! And I just feel stressed out over money and having a hard time finding a job. Also we are really tight with family so just having to hear the negatives they have to say just isn't giving me good vibes neither. My husband isn't so thrilled neither do I pretty much feel alone right now.