Dealing with family pregnancy

Just found out the my SIL is pregnant and wasn't even trying. I want to feel happy for her but I can't help but feel selfish that my husband and I have been TTC for over a year and a half and haven't been able to yet. Makes me feel like what is wrong with me that we can't have another baby. My husband told me through text so no one can seeing me bawl my eyes out and I didn't have to fake a smile hearing it the first time in front of family. How have y'all handled a family member getting pregnant especially when they weren't trying?