Oh @laurenn26 this is hard to read... you obviously are a great mother given one of your concerns is taht your current baby is still a baby. But like you said... in 8/9 months time they will be a toddler running around, eating normally, just completely and utterly different.
I will have a much bigger age gap with my 2 but we purposely tried as soon as we could (I didn't have a period for 14 months post partum) because my now 22 month old (I'm 5 months pregnant) still doesn't sleep through. I knew I wanted 2 kids and I said to myself: get the tough sleepless years out of the way together!
Also my husband wasn't great with the early months. He always used to say that he just didn't like small babies... but he's great with our toddler now. I found that when he got a bit more mobile my husband really came into himself a bit more as Daddy. Now, he's never done a night or anything like that but instead he's taken on alot more of the house stuff (so when I'm doing bedtime he's tidying up, when I'm doing the grocery shop with our toddler he's cleaning the house top to bottom etc).
I keep thinking that by the time the younger child is one... they'll be much more able tk entertain eachother! Obviously it won't be easy but it's completely doable you just need to adjust your standards!
For example: my previously spotless house is messy (not dirty, but messy)! We have agreed that once the 2nd baby comes along we will get a cleaner in for 2-3 hours a week to do a deep clean (bathrooms, skirting boards, windows) of things that I struggle.to keep on top of post-kids.
I think you should sit down with your partner and talk through if you go ahead with this pregnancy... list out (in writing!!!) what your concerns are and what you will need in order to make sure you don't burn out! More help with housework, that he does bedtime with one of the kids while you do the other, that you get X time to yourself every day or week where he is in charge of the 2 kids so you can decompress etc.
BUT all the above aside... if you feel this is not the right choice for you and your family right now then it is OK to not progress this pregnancy. I have also had a termination in the past and at the time it was the best decision for our family.
There is no wrong answer here... do what is best for your family.