A woman used to use contraceptives but abruptly she found she's pregnant. What are the causes

There are several reasons why a woman might become pregnant despite using contraceptives:

• Incorrect Use: This is the most common cause.

  • Missed Pills: For oral contraceptives, forgetting to take pills, taking them at inconsistent times, or missing multiple doses can reduce their effectiveness.
  • Late Injections: Not receiving contraceptive injections (like Depo-Provera) on schedule can lead to a lapse in protection.
  • Improper Application: Incorrectly using barrier methods like condoms (e.g., not putting it on correctly, using expired condoms, or not using it for the entire act).
  • Incorrect Placement: Diaphragms or cervical caps might not be inserted correctly or left in for the required duration.

• Method Failure: No contraceptive method is 100% effective, even with perfect use.

  • Condom Breakage/Slippage: Condoms can tear or slip off during intercourse.
  • IUD Displacement: An Intrauterine Device (IUD) can sometimes shift out of its correct position, reducing its effectiveness.
  • Implant/Patch Issues: In rare cases, contraceptive implants or patches might not release hormones effectively or could become dislodged.

• Drug Interactions: Certain medications, such as some antibiotics, anti-seizure drugs, or herbal supplements (like St. John's Wort), can interfere with the effectiveness of hormonal contraceptives.

• Vomiting or Diarrhea: Severe vomiting or diarrhea shortly after taking an oral contraceptive pill can prevent the body from absorbing the hormones, making the pill less effective.