Is this normal ?

Ok so weird as hell that I’ve been feeling this way for awhile now. My son is 6 months and I can’t help but want another baby and have a sibling for my little one that’s close in age!!!!! Should I feel this so soon after having a baby!? Why do I want want another! My son is plenty but still! Any other moms feel this way too or is this just me. (Not acting upon these thoughts yet either not trying to get pregnant)!!!