Used "bad?" Condom She Be Pregnant?

Ok, so me and my girlfriend have been dating for a year and a half. I'm 19 she's almost 18. Just last weekend on the 24th-ish we had sex for the first time. The next day we had sex two more times... All three times we used condoms and none of the times it broke. Although the first time we had sex, the very first time that weekend we used a condom that was givin to me by a friend and we don't know if the condom was any good... The other two we used were still good and brand new... What i'm afraid of is if the condom that was questionable could have let semin through even though it didnt break? What are the odds of that? Does anybody know? Right now she is having crams all the time (a week later) some chest pains (not breast, inner chest) (could be un-related) and is very very very tired reguardless of how much she sleeps... Although she is stressing a lot about family stuff right now... So this could all be stress related also! So confusing! Is it still high risk if the condom doesn't break is my question, and what are the odds of pregnancy from sex with a bad condom... Also I pulled out before I came so the sperm was never actually in here... Although i'm sure there was pre-ejaculatory fluids in the sperm... What are the odds that pre-ejaculatory sperm got though a bad condom, even if it didn't break... And trust me, we'll never use a bad condom ever again! Please someone help me? Its too early for a test and too long to wait! Her breasts havn't changed size and there is no tenderness or change in them. She has had a little discharge, but it was clear... Could her pains also come from being the first time? A little discharge was normal from her while we were just fooling around before, but usually not a week later... Any thoughts?