i would not make any decision right now !! your hormones are still going bonkers and a lot of women experience that whole , it is so wonderful, let's do it again NOW!!! after having a baby...
after c.s, you should try and leave a year to allow your body to recover...at this stage, you are not even knitted together completely.....
it is marvellous you feel so good, but think about the reality.....if you got pregnant now, you would have a 13 month old and a new born! and a 6 yr old...
take some time to enjoy motherhood, and this little baby, and the good times with your older child..if you still feel like this in 6 months, great ! but 4 weeks post partum is nothing....
best to enjoy what you have now, and then decide ! IMO
BTW< i have a 6 year gap between my DCs for the same reason, and had the oh ,it;s so wonderful, lets do this again feeling...it passed.....! happy with my two marvellous DCs and the fact i am well and happy too