How to be happy for your friends who just found out their preggo after a loss

It's been almost 5 months since I lost my baby at the 12 week mark. One of my best friends found out she's pregnant & finally told me. I'm really happy for her because she's had 4 miscarages & she's finally having a healthy happy baby. But I can't help but feel a little depressed about it too. 😞 i just can't help but be upset! I was so excited about the baby. Any advice? I really am excited for my friend. 😞😞😔