Anyone else ever feel this way?

I have two kids ages 2 and a half and 5. Both of my babies have autism. My husband and I found out they both had it after we found out that i was pregnant with a little girl that I’m due with any day. My point here is, I feel so guilty. Like, I feel like I’m taking away from them and it’s causing me to cry almost every day all day. I feel like my other two kids will hate me because of it. I keep thinking to myself that I only have a little bit more time with just them. Why am I feeling this way? I feel like an awful person having these feelings but, I can’t shake them! 😔

Any advice?