Kind of a strange answer, but I can't really scream. My voice projects well enough when speaking, but it can't actually get much louder or higher pitched than I normally speak. If I try to force it, I either get choked up, or little to no sound comes out at all
Sometimes, my voice gets that similar rasp to, but in my case that's more of a vocal cord compression and mouth shape thing, more than yelling. It still isn't any louder.
https://myanimelist.net/anime/54855/Senpai_wa_Otokonoko
Currently on Crunchyroll
The manga has already finished its main story, so if you like it, I suggest giving it a read, as well!
I have a 4 year old myself, with my egg cracking about halfway through the pregnancy. In my experience, there has been a bit of adjustment, but at the same time it hasn't made much of a difference honestly.
At the end of the day, just being a good parent, gender notwithstanding, is all that you need to be. My daughter sees both of her parents as "mom," but we try to both cover the breadth of roles that are traditionally seen as paternal, as well as maternal.
There might be some weirdness when it comes to interaction with other parents, depending on how you pass, whether you're out to the general public, etc., but we've honestly had more difficulty being "the lesbian couple" than me being trans.
Really, as long as you are providing for your child's needs, and they see you as someone who loves and cares for them, then the whole "being a mother" role becomes irrelevant, and mostly based within our own social constructs. Do what you can to be the best parent you can be, and you'll already be the best mother you can be.