please don't judge me...

I'm suffering from depression and anxiety I'm 31 weeks pregnant. Since about 8 weeks ago I feel like I can't stand my step daughter I hate it when she touches my bump and everything she does just annoys me, before I was pregnant I treat her as my own we did everything together she lives with me and her dad full time. I can't understand why I'm feeling like this towards her i don't want to but I can't help it when she does silly things it just annoys me where as before I'd think it was so funny and I hate it when she talks about the baby she even put me off the name I chose for him because she said it so many times. Why am I feeling like this? I also feeling anixious about when the babies here if she's gonna try pick him up or just make him really hard work :(