Sooooooooo.....

So sad today my SIL told my husband and I that her and her boyfriend of four months are expecting.... I could tell she was upset that it happened to her before us since we’ve been married for a year and half and have been trying since we’ve gotten married and it’s been such a struggle. I am completely devastated and numb. I feel horrible for feeling this way. I just want to cry but I want to be happy for her. Idk what to do honestly. I congratulated her but left asap so I could cry.