My girlfriend and I have sex very regularly. So out of paranoia, she took the morning after pill, one in the morning of December 24th and one at night. The next night, we had sex again but this time the condom tore.

Thing is, I had no idea the condom had torn so I went ahead and ejaculated in to her vagina. Needless to say that the both of us were really freaked out. So she took an ECP (morning after) this morning. My question is, is it safe to take an ECP not more than 48 hours after taking another ECP?
Also, what are her chances of getting pregnant if she didn't take the second ECP this morning?

thanks.