Is she pregnant..............?

My girlfriend and I have had , we always use condoms, and always check them for tears or rips afterward, and have never found any problems with the condom, she's due for her period today or tomorrow (but she has an irregular period) shes felt no signs of her period coming like shes felt in the past (really crampy, sore , l discharge) all shes had the past few days were light cramps (more lke stomach pain) and l discharge, is this her irregularity in her period, or could she be pregnant?