sister in law preg also she announced first

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I need advice! So I found out we were prego at 4wks haven't told my side of the family yet was waiting after our appointment this Wednesday at 8wks, well yesterday (easter) my brother and sister in law announced they are 8wks with their 4th this will be my 3rd  (only my mom knows about my early mc a few months back) so here's where I need advice since I planned to announce this Wednesday but since their announcement I don't want to make them feel bad or feel like I stole there thunder... should I wait  or tell them as planned? I'm just feeling not as excited to announce because I'm worried about how they will feel.. and selfishly I'm worried the excitement won't be there as much from my family because they just had a baby announcement a few days ago.