What do you all think?

My husband and I were discussing trying for baby number 3 at the end of this year. We will be able to upgrade our car and we are shooting for a summer baby! But then I thought about how my sister is getting married this summer and they’re going to start trying immediately. I don’t want her to be mad at me if it takes her a couple of months they pregnant or if we end up the same time. Or if she announces and then a few months later I do. I got married first even though I’m younger and had two kids before her. I don’t want her to think I’m always stealing the spot light or something. I think it’s be fun to be pregnant together but I don’t think she’d like it. Should we wait or what advice do y’all have?

We said we didn’t want to have 3 kids and stop at 2 but now that my youngest is getting older, we are starting to change our minds. But I feel like she’ll say we just did it in spite of them. Idk what to think or do!?