Day 8 Poo poo problems

My son has been mostly going poo in his diaper at nap time and at night so I really did not realize that he does not want to go poo in the potty! These last two days, we take him to the potty and he goes pee, then he gets down, goes behind something and poops! It is very frustrating. I also understand that is is very common too. I knew I could not get out of this whole experience without some issue. I am not sure yet what I am going to do but I think the only thing I can do is to be more vigilant and try to catch him before he poos and put him on the potty. Oh well, the potty training continues...