Baby fever!

So my boyfriends sister is pregnant and I'm excited for her, but it gives me baby fever and makes me anxious about having kids myself. I know I'm not ready for kids and neither is my boyfriend, but this baby fever is getting to me.

I also babysit a baby that is 6 months old and it doesn't help with the baby fever, it just makes me want one of my own more.

Is there any advice anyone can give me??