Half sister has my same due date

My half sister has the same due date as me: April 1st. I found out a month before she did but since she found out it’s been like a competition... she found out the gender first with a sneak peak test, announced a name first, did a maternity photo shoot.... and that’s all fine. But I didn’t do any of those things. All I’ve done is post bump pictures or ultrasounds on Facebook and pictures of the nursery I’m working on. Every time I make a post, she makes one that same night or the next day. I at first thought maybe it was coincidence or she wasn’t knowingly trying to one up me HOWEVER I posted a photo of the nursery today saying something like “any time now, kid” and she sent me a message saying “the race is on lol.” I know I’m hormonal right now but that upset me. I want to be able to post things without her sending those messages or posting right after I do. With my luck, I know she’ll deliver before me. I don’t see it as a race, I just want my baby here and I want my sister to be supportive rather than competitive.