Potty training regression

My toddler just turned three. We started potty training in the summer while I was pregnant with my second. It went decently well the first two weeks but then it just became more difficult. I had my second baby in November and we just completely stopped potty training. He still isn’t interested and will just go in his pull-up. I am exhausted taking care of him and now a newborn. Mentally I just don’t know what im going to do. I wish there was a guide. Has anyone else stopped and then started again and it turned out successful? Idk where to begin.