That's not odd. Some women's periods are longer then others. Some women only bleed for 3-4 days, some for more like 6-7 days.
That said, if you're having unprotected sex whether you ejaculate in or not is irrelevant. There can be sperm in precum which you can't feel and it can get her pregnant. The pullout method is not effective at all in preventing pregnancy. There's thousands of girls out there who are now parents because they tried to use the pullout as well.
So unless you're purposly trying to have a baby, i'd suggest you wrap your willy or hope she's on some sort of hormonal birth control. :-)