Thoughts ladies?

So, my sister is 9 weeks pregnant and I am getting married next year 2020 in Vegas. My fiancé and I were going to have a big wedding but my sister was saying how she didn’t know if she would be able to afford my bridal shower and bachelorette party because she “is not going to stop trying to have a baby.” Hence, I spent so much on her two parties when I was trying to afford my own apartment. We have bad fights about the stupidest shit. She starts everything. She compared me to her sister-in-law and how she is a better aunt and how her sister-in-law actually wants to see her niece. She has said some nasty stuff to me that she can never take back. Now, she is pregnant and I feel like she’s doing this so it can be all about her. It’s just ironic that she didn’t get pregnant before now and now, it’s right before my wedding. I feel like she is taking the easy way out. Any thoughts?