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Implantation Bleeding and Other Implantation Symptoms

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Fertilization and Implantation

Fertilization occurs when the egg and sperm join in the fallopian tube. This fertilized egg, called a zygote, travels down the fallopian tube toward the uterus, growing and dividing. Once the zygote has developed into a blastocyst, it can implant into the lining of the uterus. Implantation generally occurs 6-12 days after ovulation, often around the 9-day mark. Once the blastocyst implants, pregnancy occurs and a woman’s body begins producing the hCG hormone.

Implantation and Early Pregnancy Symptoms

Unfortunately, only a minority of women are able to detect any physical signs of implantation. While the following symptoms may indicate that implantation has occurred, the absence of these signs does not necessarily indicate that there is not a pregnancy. In the same way, even if some of these symptoms exist, it may be a misinterpretation of normal menstruation symptoms and is not a positive indicator of pregnancy.

Pregnancy Implantation Symptoms:

  • Implantation bleeding (generally short-lived pink or brownish spotting, but can be similar to a light menstrual period for some women)
  • Implantation cramps (lower abdominal cramping)
  • Basal Body Temperature (BBT) shift:
    • Implantation dip (a one day decrease in temperatures at time of implantation)
    • Triphasic BBT curve (a rise to a third level of temperatures)
  • Hot flashes
  • Positive hCG test (detected in a blood test first)

Typical Early Pregnancy Symptoms:

  • Fatigue
  • Breast/nipple tenderness; noticeable veins appearing on breasts
  • Nausea
  • Frequent urination
  • Bloating of the abdomen
  • Headaches
  • Dizzy/light-headed
  • Mood swings
  • Increase in vaginal discharge
  • Constipation
  • Food cravings/aversions