I can understand wanting another one so soon. However, make sure that is what you want as well. Pregnancy back to back is hard. My first two are 21 months apart. This is getting pregnant around LO first birthday. I like this spacing, it's close but you can manage. After my first two I had my "surprise" baby 13 months later. This was hard. I felt guilty that I didn't get to be the best mom to my new baby because I was pregnant and my body just hurt. My two kiddos that are 13 months apart have a special bond but it has been hard and still is, they are 2 and 3 years old now. That being said my 2 year old is already potty-trained and I didn't have to do anything. He has to do what his sister is doing. Competition starts early, I guess.
Maybe it wouldn't have been so hard if they were my only two, I don't know. I like that they are growing up together and I could use all of the baby stuff again. But it has been hard, physically and emotionally.