Some people prefer to wait to announce their pregnancy on social media until the mum's bump is showing, which is typically around 4-5 months.
By this point, your partner will have really bonded with your baby and her bump, so you might prefer a pregnancy announcement caption that is quite touching and sentimental. Or, there's a tonnes of bump-related puns you could use.
One of our favourites for dads to use is "I like big bumps and I cannot lie".
But just like all the other announcement, however, it should be what you and your partner want. Not what anyone else thinks.