My first pregnancy would be 26 this year, 2nd they'd have been 17 last month.
I found the 2nd harder as it required more medical intervention and psychologically I did everything 'right'. The first pregnancy I was 18, single (had split from baby's father), and on the pill.
2nd pregnancy I was married, it was planned, I was healthy and not on any medication. It felt so unfair 
I now have dd aged 16. But I still remember.
The 1st one the amount of blood shocked me, yet there was little pain.
The 2nd a very small amount of bleeding but scan revealed no heartbeats. Lots of pain as had to have 3 surgeries and needed a lot of recovery time.
With the first one only my dr and a friend knew that I was even pregnant.
With the 2nd it happened further along and I'd had terrible morning sickness so more people knew, was so hard telling people. Harder still having people who hadn't heard coming up to joyfully ask how it was going only to have to tell them I was no longer pregnant.
I learnt who were real friends and who weren't.