AITA for telling my SIL that she can either get over my previously undeployed implant or get out?

I have PCOS. Because of this, it can be difficult to conceive. My SIL and I both have this, however I was able to get pregnant with my husband where as she has not been able to conceive with her husband. Me getting pregnant first really set her off and she has been making passive aggressive remarks about how easy it was for me to conceive.<br><br>She was particularly nasty about my first pregnancy and accused me of lying about how hard it was for me to conceive. I told her to stop and to believe me when I say it was not easy. She got angry and said that I was calling her a liar (I wasn’t) and she went on a rant about how I was the reason why she was sad and how I needed to get an abortion (not happening).<br><br>This caused a massive argument between me and my brother (who took her side!). My husband was very upset and he said she had to either get over her feelings or get out. She got angry and called him names. After that, we didn’t speak to her. My brother and his family didn’t come to my baby shower or my baby’s birth. <br><br>Well they recently came over and she made a comment about how I didn’t deserve to be a mother because I didn’t “deserve” my baby. I told her to stop and that she can either accept me and my kid or get out. She got angry and called me an AH for saying that. My brother and his family left after that. My mom was very upset by all this and told me I need to forgive my SIL. I told her I wasn’t going to forgive her. She told me I need to get over it because I shouldn’t be calling my SIL names or insulting her. I snapped at her and told her it was the other way around.<br><br>AITA?