I've had stents in pregnancy. You do not want them. They are so painful. I passed at least one stone each pregnancy. Usually multiples though.
Drink a ton of water, avoid leafy greens, soda, tea, and grapefruit.
If you get another one, you can take Flomax (prostate med). 95% of people will pass their stone within 12 hrs.
The reason you're peeing out bits now is because you probably scraped the crap out of your ureters. So you may be passing bits of clot/scabbing from your ureters.
And it is more stressful for your baby for you to be in agony than for you to take meds. Really. Take them.