I'm always amazed people can get pregnant so fast, I think I would have cut DH cock off if he came near me in the first 2 months after birth lol.
Congrats though, I always thought twins would be really cool and apparently its great as you get all the hard phases out the way at the same time (same with a super close age gap). It much easier to keep a 3 year old and 4 year old occupied together than to plan a fun family day out that meets the needs for both a 4 year old and 9 year old etc... we hit this issue with a 10 year gap, makes planning something impossible, teens don't want to do kid stuff and kids can't do teen stuff so everything feels like 'settling' on something someone won't enjoy. My younger 2 with a 2 year age gap can do loads together though.
My SIL had 2 in under a year (over 20 years ago) and both where complex C sections as well and her and the kids are all fine so even with complications it can be done without dramatic horror outcomes some people on mumsnet love to default to.