Family and pregnancy rant

My SIL and I have never been "close". We get along fine when we're around each other but she's very condescending and catty. Everything in life is a big competition and she's always trying to "keep up with the Jones'" But she has a 4 year old and she had a very rough pregnancy with him. She bled heavily on and off for months and had him at 27 weeks. He was in the NICU for 3 months and he is prefctly healthy now, but it was a long scary road. So my husband and I had our first almost three years ago and the moment she found out I was pregnant and she said "if you decide you don't want to do this I won't tell anyone" 😳 like what the heck who says that? I obviously wanted to have a baby and we were very excited but she tried to get pregnant pretty much throughout my whole pregnancy and I couldn't help but feel like she was trying to steal my thunder! She did get pregnant but ended up miscarrying. 

6 months later she gets pregnant again...my son was 6 months at the time and when she shared the news she got in my sons face and said "haha you're not the baby anymore" he was SIX MONTHS old... I felt like after that comment pregnancy again was a competition to her and bringing a child into the world should not be something you do to try and one up another person. The whole situation just left a bad taste in my mouth. 

Now almost three years later my husband and I have just had our second little boy and she really kept her distance and didn't say much through my pregnancy. Now he's 6 weeks old and she just told some of our mutual friends she's pregnant... 

I'm really confused on how to feel. I want to be happy for them but again I don't feel like she TRULY wants a baby but she wants the attention that comes with having a baby. And I do hate it for her and I do think she wants to experience a normal pregnancy but at the same time I just can't get over some of the comments. She's even said if I could get pregnant and know it was for sure going to be a girl I would keep doing this... To me it's not about having a boy or a girl it's about bringing a new life to love and raise into the world...I just feel like nothing is genuine about it. I hate feeling this way it makes me really confused and sad to think someone has alteriave motives about being pregnant. Just don't know if I'm out of line to feel this way or not...