Hi there
I went thru something similar in 2020. I have two lovely kids and my youngest was only 11 months old and I had already done 2 under 2. Mentally and physically I could not have gone thru another pregnancy, sleepless nights and anxiety of having another dependent.
My heart ached, I tried for another child (but didn't get pregnant! Thank God!) The guilt was real. I went into depression and needed medication. My husband is traumatized from seeing me in that state.
Even after three years, I can tell you that it was the right decision but a tough one. I still have the guilt and the sadness but that's mine to deal with, my kids aren't suffering. I have more time, patience and money for them.
Media plays a big role into making us mums feel bad about such decisions. They make motherhood look amazing, but it's a lonely and an unappreciated role. They show only young girls who aren't aware of contraception, get terminations. Instead of middle-aged mothers who are drowning with all these expectations. I have been with my husband since I was 18. All those months/years I didn't get pregnant and no one congratulated me for not getting pregnant. I took pill for 10 years before deciding to get pregnant. I wasn't on contraception because I was breastfeeding and one time I made a mistake and got unexpectedly pregnant, I am expected to feel like a monster because the society tells me too! How bloody unfair. If someone drives fast (knowing the speed limits) and crashes, society won't make that person feel as bad as they make mothers feel.
We are all silently suffering and there is no reason too! I would tell you to wake up every morning and tell yourself that you are doing an amazing job raising three humans. You are a person who has its limits and it is okay. It is okay that you had an accidental pregnancy and it is okay that you didn't carry on. You will honor that choice by giving your 100% to your existing children. You have to be healthy and happy for your earthly kids.
I hope it helps.
Lots of positive energy your ways.