Need help toddler wont sleep

SA

For the past few weeks, esp the last few days my 2 1/2 year old keeps getting up in the middle of the night. I’m talking anywhere from 1am-3am an wont go back to sleep for about another 1-2 hours. I work part time, and when I’m not working he is home with me and I’m taking care of him on top of the house. All while I’m 5 months pregnant. It’s really starting to take a toll on me physically. I know I’ll have to get use to it with baby number 2 but I’m sure I won’t have the pregnancy hormones wearing me down and I’ll be home on leave. I honestly just don’t know what to do..... I’ve worn him out so much during the day that it shocks me he doesn’t sleep thru the night esp when he has been at daycare all day. I just wanted to see if there where different tricks or things you ladies did to get your kiddo sleep! I’ve asked the few friends I know with kids my age but none of them have seen to have this problem. We just moved to a big boy bed this past weekend but the first 2 nights he did great an slept thru night. I don’t want to go back to crib and even if we did he can get out of it so im stuck either way. ( to save the questions about where my husband is, he works full time and provides for our family, during the week he will offer but I know he has to work so I get up, on the weekends if I absolutely can’t he will get up with him, during the evening he’ll come home and offer for me to go up stairs and relax or take a car nap so i do get support from him) just any advice will help thanks!