Based on your history:
Last menstrual period (LMP): 15 July.
Sexual intercourse: 31 July (around cycle day 17).
Some intercourse was protected, and some was unprotected.
Ejaculation occurred outside the body (withdrawal method).
Because there was unprotected penetration, even though ejaculation was outside, pregnancy cannot be completely ruled out. Pre-ejaculatory fluid may occasionally contain sperm, and withdrawal is not a completely reliable contraceptive method.
Do you need emergency contraception?
If less than 72 hours have passed since the unprotected intercourse, you can take levonorgestrel 1.5 mg emergency contraceptive (e.g., Unwanted-72 or an equivalent) as soon as possible. It is most effective when taken early.
Most side effects are mild and temporary:
Nausea or vomiting.
Mild abdominal pain.
Headache.
Fatigue.
Breast tenderness.
Spotting or irregular bleeding.
Your next period may come a few days early or late.
These medications do not affect future fertility.
Next Steps
If you take emergency contraception and vomit within 3 hours, you should take another dose. If your next period is more than 7 days late, do a home urine
pregnancy test.