Sister drama !!! Stressing me out!

Sonja
So my sister who is older than me is having her wedding is September my due date is at the end of October me and my husband planned this baby's (I'm having twins) this is my sister second marriage and she already has two children this is my first child she told me yesterday that I was selfish to get pregnant this year because she's getting married and I stay in New Jersey she stay in North Carolina so I will not be able to make it this really hurts my feelings and I feel down about it she won't call me or check with me at all because she's mad that I can't help with the wedding it's like she doesn't understandcan somebody please tell me that I'm not as bad if she's making me out to be