Thinking about getting tubes tied after this one

Hey everyone. I'm 26 and pregnant with my 2 child. I've been thinking a lot about getting my tubes tied after this baby. I have a almost 6 year old who falls on the spectrum and have gone through 3 miscarriages to get this rainbow. I think I'm good with 2 kids and really don't want to go through anymore heartache or pain. Ugh...just had to vent. My mom is against it.