Congratulations and welcome!
If my blood draw give us good results today, then we are contemplating telling my parents tonight. I find it stressful to try to hide it from them and we will be spending so much time with them over the next week or so. Normally I'd be drinking wine with my mom each night, so they'll basically know either way. I'd just rather come out with it, then have it be an elephant in the room.
I also want to celebrate this pregnancy for how ever many days I have and I'll need their support if we have another heartbreaking loss.
Its totally up to you, but you won't be the only one announcing super early if you do.