Upset but happy and trying to be STRONG!!!

My husband and I found out yesterday that his sister is pregnant!!! She was just in my wedding and we had no idea. She hid it from everyone for a long time because she was really embarrassed. A little background about me- this is my 2nd marriage. My ex-husband cheated on me and is now marrying his mistress. Here's where my struggle is- her baby's dad is married 😕 she's been having an affair with him for a really long time (I had no idea...) I'm so excited for this baby to come into the world- she will have our unending support of course! A baby is a gift from God and I can't wait to be an Auntie!!! But part of me is really struggling with the affair situation. I've just been in a funk over it since I found out and I just want to not think about it negatively and move on and celebrate the pregnancy. But the fact that she's been sleeping with a married man for years and I was cheated on, it just stirs up all kinds of feelings for me that aren't pleasant. I guess I don't need advice as much as I just need prayers/positive thoughts so I can show her all the love and support in the world and not think about my own selfish hang ups. 😣😣 AND im trying to get pregnant so throwing that on top knowing she didn't want to get pregnant, that's another hurdle. I just need to vent and I'm just trying to be strong for her and happy in my current life. Ahh the struggle!! 😫