Tips and advice please!!!

My son is 1 and 3 months old. I still breastfeed him to sleep for his nap and for bedtime. Yesterday though, I found out I’m pregnant with my second baby. I also bed share with my first and I’m already worrying about how to start the weaning process because these 9 months will go by fast and at the moment I am the only one who can put him down and then keep him down through the night because he still wakes up a few times a night to eat or comfort. He does not use pacifiers and he does not like bottles nor any type of juice or milk 😭. Do any of you mamas have tips??? I’m already worried about going into labor and leaving him here with family because he won’t sleep PLUS I know I’ll get shit from my MIL constantly to wean and stop bed sharing because she already expresses those opinions so I can imagine when she finds out I’m pregnant 😫