Is it normal that i feel like this? Feeling down

Im pregnant the same time as my SIL (husbands bros wife). Our 1st after alot of struggle, their 2nd.

Our due dates are less than 1 month apart. Hers is late june mine is early july.

Me and husband tried for nearly 3 years, clomid, <a href="https://glowing.com/glow-fertility-program">iui</a>, <a href="https://glowing.com/glow-fertility-program">ivf</a> which resulted in a chemical at nearly 5 weeks. So this natural pregnancy came as a big surprise, a good one of course. Husband told me today that Sil is expecting, is it normal that i feel really upset and annoyed by this? I think its because it feels like our special time is being taken over and dampened. I just wanted to feel special for once 😔😔😔😔😔. I know i should just be greatful but i cant lie, i do feel really really crap about this, especially since our dates are So close. We dont talk or really vibe or get along. Any advice?