Potty training restart with newborn on the way.

My son is 3 in July and we attempted potty training in the middle of March, he really wasn't getting it after 2 weeks and felt like it was stressing him out so we stopped. I am unsure when to try again, as once we try I don't want to stop again however we have another baby due in 4 weeks. Is it wise to try again now when he then might regress again due to the baby or just leave it and do it sometime after the baby is here?