2 under 2

So I have an 11 month old. And just found out I'm pregnant with our second, I'm kind of freaked out because we were just starting. And I didnt think it would happen so quickly. And basically the 2nd babe will be here 4 months ish before our daughters 2nd birthday. I'm looking for any advice! Or any tips. I have such mixed emotions about having two so close in age.