Idk what why I’m having these feelings

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So I been trying to get pregnant for about 18 months and I had sisters that gotten pregnant and I just found out one of my coworkers is pregnant too and I’m kinda upset like I’m not mad at her I wanna be happy but i can’t I feel jealous idk deep inside im sad I just keep thinking of it I wanna be happy for her but I can’t and I don’t want to feel that way because if I was in her place I would want her to be happy for me