Pregnant bridesmaid!

I'm a bridesmaid in a wedding in early May... I'm due May 31st so I will be very pregnant. I haven't told the bride yet but we are cousins and very close so she will be excited for me. I think the dress she picked has a maternity option but I plan to call the bridal shop and let them know the situation. Any advice from those who have been in weddings pregnant? I'm still really looking forward to being a bridesmaid !