Well, she may not actually have been pregnant from the first breeding, in which case she may now be and could have babies in another 30 days. Or she was pregnant, but this second breeding didn't take and therefore won't affect the first pregnancy. Or she was pregnant and she could then get pregnant again in her other uterine horn, which could then end up in none of the babies surviving and even possibly the mom not surviving due to complications. You'll know for sure in either another 10 days, or 30 days, what the outcome is.