Telling sister

M 👱🏼‍♀️
If all goes well at our appt for 8 weeks next week we plan on telling our families right after. I'm dreading telling my sister. She's been ttc for a year now and she's the oldest and married the longest so the pressure has been on. I know deep down she will be excited but I know she will be hurt. Any thoughts or advice on how I can tell her?