Erin, I'm so very sorry. Your posts just break my heart. I can understand the irony of dealing with death right before big things happen. My grandpa died a month to the day before my wedding. My grandma died 2 weeks before my daughter was born. My Mom died when my daughter was only 4 months old and one month before my husband's first deployment.
It seems like so much to happen all at once. Please be gentle with yourself. I know it hurts... and I know you want to sit in your hurt. That is ok. You will do what you have to do... just because you have to. But don't 'should on yourself' too much.
There are actually quite a few of us girls here who lost a mother either right before or soon after giving birth... It's hard. It hurts in so many ways. Your joy is double-edged. You are so happy about the dear child you hold, but so haunted by the fact that your Mama isn't there to share it with you. We're here, and we'll support you.
Many, many (((((hugs))))) to you. Take it a second at a time for now.