Can pregnancy occur if he ejaculated from previous sex that day but didn't during this time even though the condom broke?

There is always a chance that pregnancy can occur if the condom broke. Sorry. There is sperm in the liquid that comes out while having sex. So, yes if the condom broke there is a chance of pregnancy, but not from the previous ejaculation Unless of course you are using the same condom which you should never use a condom twice.