Sending you strength and calm decision making OP. My feeling is by posting this question, you have enough doubts about termination that you’re willing to be convinced of the alternatives. As someone with a 13 month gap between me and my sibling, I can honestly say it was an incredible childhood. I’m sure my parents were beyond exhausted at times, but I’m not sure this exhaustion is much different than having a 2+ yr age gap between the kids. There are so many ‘what ifs...’ to keeping or terminating the pregnancy, irrevocable choices, they are exhausting in themselves.
There is a wonderful poem by Tomas Tranströmer called “The Blue House”. It describes an old man standing in the woods looking at his house from a new angle, feeling joy for the life he had, but also deep sadness for the lives he didn’t lead. Every life, Tranströmer writes, “has a sister ship”, one that follows “quite another route” than the one we are ended up taking.
Obviously you want clarity on which course to take. But perhaps if you take a step back and look at your blue house, you’ll see that there will likely be no clarity, at least at the outset; there will only be the choice you make and the sure knowledge that either one will contain some loss.
I encourage you to look at this scenario from the stance of your future self, perhaps this will help balance your immediate desires against your fears. Think about what you’d regret more. The path with the greater regret (because they will both likely involve regret) is the one to avoid. Write a list, examine it deeply, “same life” vs “life with closely aged children”. Would the temporary loss of energy, sleep, sanity be outweighed by the experience of achieving your dream of having two children? Would the chance of not conceiving again cause too much mental anguish? Would the exhaustion of being stretched too thin between two kids cause you resentment?
Your lists will be your life and your sister life. One is the life you’ll have, the other is the one you won’t. Switch them around in your head and see how it feels. Which is ruled by fear? Which is ruled by desire? Which makes you want to close your eyes and jump? Which makes you want to turn and run?