Hello. I have some questions regarding to the delay of menstruation of my girlfriend. She is 21 yrs old and I think shes irregular. Sometimes she has mens so early sometimes regular cycle. We had sex and I use condoms always. But I used a condom that is stock in.my wallet for 1yr and the expiration date is 2015. I am worry because she is delayed for a 1 week and she feel shes having her mens. Sore boobs and back. We didnt try ptest yet. I just want to know if shes pregnant. Because im worry somuch. Help us. Thank you.