Pregnant again!

I have 2 kids one that will be 3 in August & a newborn baby that was born in March of this year. & I know I should have waited it was really not in my plans I couldn’t stop crying when I saw the plus sign in my pregnancy test. I just want to know how hard can it be with 3? What are your advices I’m freaking the fuck out literally I’m just 23 & when this baby is born my second will be 11 months 😐 I never thought I would be in this position, I was suppose to start my bc since I recently stopped breastfeeding no judgement please I know this was irresponsible.. literally I just want to know anybody’s experiences with 3 small kids