Mommy’s help!

I have a 6 month old and I’m currently 2 months pregnant I am so exhausted and wish my little one was on a good schedule but she has had her days and nights mixed up since birth. I dont know what to do I’ve tried transitioning slowly and she has literally stayed up all day and napped and stayed up all night just to go to sleep at 6 in the morning I DO NOT want this to be our schedule when baby #2 is here. any pointers?