I have a few things.
I had my first son and ended up being a single mother for about 5 years or so.
I got myself through nursing school while being a single mother. That was hard because I was working full time, going to school full time, and parenting on my own (I had sole custody since my ex didn’t want anything to do with my older son and my ex didn’t pay child support). I didn’t have much of a social life during that time (which led to the next complicated accomplishment, my second son (Nimmy as @JilltheTooth calls him)).
I convinced my old OBGYN to give me a tubal ligation as a 26-year-old single mother with one child. Three weeks after the ligation I started dating my husband. Fast forward about 2 and a half years and I convinced an OBGYN to do a tubal reversal with me being in the hospital for the surgery alone. My husband was deployed at the time and all of my family was on the opposite coast. I had the tubal reversal, waited a few months for my husband to get home, and then got pregnant. The pregnancy wasn’t too bad, but the end got complicated and he spend a few days in the NICU. Having him in the NICU and not by my side after having him was one of the most difficult things I’ve been through emotionally in my life.
Ohh, and I just wrote that whole post with one hand as Nimmy is in my other arm sleeping. :)