Please help!!! important!!!?

ok so me and my gf have been getting intimate and we had"" a few times but not really considered that.. everytime it was just because we got carried away but we stopped ourselves and it was in for about 10 seconds then she would just give me head and i would get off. but most of the times when i would take it out like a minute later pre would come out when she was touching it.. im kindof worried because she was supposed to get her period the 23rd and still has not had it. she has had mood swings and is very hormonal and dizzy etc... but also she has been sick thi whole month, like stay home from school sick and her doctor said she is at the early stages of pneumonia and she has not been feeling good this whole month. i was wondering if she is late on her period because she is sick or something else that i dread to hear.. please help serious answers please.