Need advise on what to do?

My sister is pregnant and I'm very happy for her but she will be 9 month pregnant or just given birth around the time of my wedding and I'm scared she will either flake on being a bridesmaid and or doing the make up which I'm paying her to do... this sounds selfish but I've been enaged for a year and won't be married til August of 2024 and during this year of being engaged I didn't mention my wedding to much because she had just got married and so did my fiance sisters so I took the back burner well I thought it would be my turn to have a little attention for my event and some help but I just feel ignored again and I don't know what to do about any of this... so what do I do or say to my sister and how do I do it without looking like a bad guy?

Need advise on what to do?
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