What to do???

So I just found out my SO wants another baby (mind you just had baby boy 2months ago) and we have been trying but doing nothing to prevent as I'm not on birth control and we don't use condoms but he has been pulling out besides yesterday.... Ugh how do u Mamas handle them so close in age ...... I'm still trying to figure out our schedule as baby boy isn't on a schedule ugh... I'm torn as he's older than me and NO baby boy isn't his (not that is anyone's business but mine ..... But I just don't want any questions about that) i love him so much... I'm 20 he's 28 we want 4 or maybe more undecided and I'm not getting on birth control as it doesn't work and I don't want chemicals in me... Advice? *Please be nice*