I need help with my 2year olds sleep 😩😩

Hey ladies, my son is 2 years and 4 months old. He has been in a single bed for about 2 and a half months bow cause he fell/climbed out of his cot and cut his lip on his tooth when he fell on the floor so he hasn't been back in the cot since lol.

He takes about 10-30 mins to get to sleep at night which is great. He gets up a few times and I just put him back and he eventually stays in and goes to sleep. He is usually asleep by 6.30pm, that's always been his bed time and that's just what works for us.

He wakes up during the night and takes anywhere from 5 mins to 3 hours to get back to sleep and I'm exhausted ! I'm also 31+5 days pregnant.

I have no idea why he wakes up and it's so frustrating ! He used to sleep ALL night in the cot since he was 9 months old and I sleep trained but now he wakes up !

I fall asleep during the day cause I'm so tired and just wanting to know if any other mums have been through this or if you have any advice ?

He wears a bodysuit, a onesie and a sleeping bag to bed every night so I know he's not cold.

I need to try and get this sorted before my baby is born as I don't wanna be up with a newborn and my toddler all night 😭

Any help or tips and tricks would be appreciated !

Thanks 😁