Hope things are ok with you today @TwinkleStars15 and you've had some time to digest, think and talk.
I found out I was pregnant again when my DD was not even 5 months. Although we knew we'd always wanted 2 kids, I felt it was far too soon and had all the same feelings as you. My biggest fear was that I wouldn't love the second baby as much as the first. I'll be honest, the pregnancy flew in and I didn't really enjoy it, I didn't even feel mentally prepared by the time I went into labour. The first few months of DS's life have gone by in a bit of a blur as we have found our way with all those practical things (how to keep a 13 month old safe while feeding a newborn, finding a sort of routine that works etc). Now DS is 4 months and DD is 17 months and I couldn't be happier with our little family.
I had to go back to work earlier than planned and was back at work for 3 months before my second mat leave started. Yes I cried that first day, like most people probably, but it was fine. Now I'm off on mat leave again and I'm spending much more time with DD than I would have done if I was working, and saving a lot on childcare. Having 2 so young means we can have lazy days in the house if we want, no getting older kids out of bed and fed and doing the school run. As they get older hopefully days out will be easier as they'll be into similar sorts of activities. And the pregnancy/childbirth/newborn stages are now all out of the way, so we can focus now on raising our 2 kids. The older one was too young to get jealous or really understand so she's just taken it all in her stride, and she gets so excited when she sees him which would make your heart melt.
I felt exactly like you did when I found out. You'll make the right decision for your family, which may or may not be the same decision as us, but I guess I just wanted to say that you don't need to suddenly feel really happy about this pregnancy for it all to work out ok. I felt quite emotionally detached during my second pregnancy, although I didn't really admit that to anyone, but now I couldn't imagine our family any other way.