Am I a bad person?!

Lorena • Momma to 3 beautiful babies!🤍🤍🤍
Ok so recently my sister in law and my brother found out they're having baby #3, my fiance and I had been trying to get pregnant for as long as they have but stopped because we just have to many problems right now. Today my sister in law got her first ultrasound, she sent me a picture and I litteraly cried! I got so upset because I would of loved it if that was me. I obviously told her I was happy for them and she has no clue how I'm feeling, am I a bad person for not being so happy for them? I will obviously love that baby because he/she is my family but it just got me so upset I couldn't get pregnant and now we're not even trying. I don't like feeling like this!