Advice on telling sister

Megan

I need some advice! I have an identical twin sister who is my absolute best friend. Her and husband have been TTC for the past two years. I’ve seen my sisters heart break so many times. It turned out to be her husbands swimmers. Well this was my first month tracking my ovulation and fully ttc and we got lucky! I want to tell my sister eventually but I’m not sure how to break it to her because I know she will be devastated. I feel guilty that it happened to me so quickly. I know she will be happy for me in the end but it will hurt her. Any advice? I plan on telling her after my 8 week scan. Thanks in advance 🙂