So it’s not safe to get pregnant at 9 months pp?

Me and my husband want to have another baby and we have started trying and I stopped my bc. I had a really good labor and birth with no tearing and I got my first period at around 4 months pp. I’m ebf.

I feel like now that we’re trying I’m constantly reading people post that your body isn’t ready until 18 months pp. is that true. It’s freaking me out because we have alrwsdy been trying for a few weeks so it may be too late.