Pregnant again?

I’m 6 months postpartum and I really am considering another baby. I am the oldest so my siblings and I didn’t really do much together because of the age difference. I’d really like for my son to have a sibling somewhat close in age to him but I feel like I’d get judged for getting pregnant again so quickly.

Little backstory: when I joined glow in 2015 I was ready to have kids. It took us 4 years to conceive, I thought something was wrong with me. I had given up at this point, I threw out my pregnancy and ovulation tests. Threw out the preSeed and just stopped trying. Well god had other plans, on Mother’s Day 2019 I got a positive test. This time around, I’m nervous it won’t happen again. I’m scared that my son was literally a miracle and it’s one and done. I want a big family but I’m conflicted. Is it selfish to want another baby when I still have a small baby? Will I be able to give my son allll of my attention ?