We bought my mom a diamond necklace and a card that said something like
"congrats Gramma!!"
lol.
Yeah it was a nice way to tell her... but everyone in the family already knew because of how sick I was. (Was so sick I started missing work within 3 weeks of becoming pregnant)
You can tell your parents separately there's nothing wrong with that.
But you do need to tell them soon if they're your way to get prenatal vitamins.
It's good that your boyfriend is starting to set things up for you guys, if you ever need to talk to a Mommy, I'm always here.