Jealous/annoyed

I feel weirdly jealous and annoyed when my sister in law talks about her baby that is due in march. I just switch off. I am 12 weeks and everything is good. So why do I feel like this? Im dreading meeting her baby. And it annoys me my 2 yr old daughter will meet her baby before mine. So silly 😣

I had a MC in September and feel like this is when it started but thought it would've got better by now.

We have never really got on 100% so that doesn't help.