My sister is rubbing her pregnancy in my face

As teenagers, my older sister always told me that I better not have kids before her because she wants to make our mom a grandma first. Then as we got a little older and I got engaged shortly after high school, she said she had accepted the fact that I would probably have kids before her since I had been in a serious relationship for 3 years at that point and then got engaged. I don't even think she was in a relationship at the time (this was 4 years ago).

Now I have been TTC for 2.5 years and had an early miscarriage within the first year (no one knows any of this). This has been a rough few years to say the least. I'm married now to an amazing man, we moved out on our own right after we got engaged, and have made a great life together on our own.

My sister on the other hand, has been no where near the point of her life where she would be ready for kids yet. She's 7 years older than me, but acts as though she is 7 years younger. She has been living with our mom the majority of her adult life and only recently started making her way out on her own. She has a different boyfriend every year who is "the best man ever", "the one", etc. But in reality they were always complete scum. Over the last few years I have been on edge a little at family gatherings because I always have a feeling she is going to announce that one of these "men" got her pregnant. That day has arrived. Don't get me wrong, I'm excited to have a niece/nephew, but I know this was not planned which makes it even harder. Not only that, but she is now rubbing in my face like, "haha I got pregnant first", "I'm going to give mom her first grandchild", "everyone thought you would have a baby first, but look at where we are now".

I just feel like curling up in a ball and crying. Like I mentioned before, no one knows we are TTC or that I had a MC, so I can't be mad at her because I don't think she would be saying these things if she knew the truth. It has just been a hard day and I needed to vent.

Excuse me while I go cry now.

-EDIT-

WOW! Some of you clearly only read what you want to read and you bring your own interpretation. It clearly shows who read my entire post and read it as it is, not how they wanted to perceive it.