i stopped breastfeeding at 3 months my kid ia now 8 months and im also 9 weeks pregnant i want to…

i stopped breastfeeding at 3 months my kid ia now 8 months and im also 9 weeks pregnant i want to start back breastfeeding my 8 month old because i feel like i can not find a formula to sit well with his stomach . can i do this? there is a little bit coming out of one of my boobs but only a drop how long will it take to get up?