My last period was september 25th 2017 for 5 days. we are now coming into february 2018 and i have missed 4 periods with some spotting in november and?

Time to see a doctor: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy is a common cause of a missed period, if sexually active.