Does missing a period and getting it a week later mean pregnant?gf has irregular periods just dont know if missing and getting it a week later is norm

Not necessarily: Many women have occasional variation of their menstrual period timing, some spotting between periods, a heavier period, a lighter period, a longer or shorter period, or even a missed period. Having one or two of these symptoms doesn’t necessarily mean there is a medical problem, but a visit to one’s primary care or Ob-Gyn doctor is a good idea if symptoms are persistent, recurring, or worrisome.