How to tell our older daughters, we pregnant

Beena • TTC 10 years recently miscarried our baby boy. Praying for another miracle.

Hi all, Found out we are expecting after being together 10 years and being told i had too much scarring and blockages on tubes to conceive. We are really excited. Question is how and when do we tell our 2 daughters (1 each from previous marriages) that we expecting? 1 daughter is 23 and the other 21. We are really happy but worried how theyll take it. Im 5w2d today