Can a β-hCG of 0.5 mIU/mL in females indicate pregnancy?

Question

Hello doctor,

About two and a half weeks ago, I had unprotected sex with my ex. I did not ejaculate inside her, and the intercourse lasted only a few seconds. She took Plan B approximately four hours afterward. Last week, I saw clear signs that her period had started. However, after two days, she claimed her hCG (pregnancy hormone) level was 14. The following day, we went to a hospital together and had a blood test, which showed an hCG level of less than 0.5 (or 5) and a negative urine test. The attending doctor confirmed she was not pregnant at that time.

The next day, she reportedly went for another test on her own and presented results showing E2 (estradiol) - 279 pg/ml, PROG (progesterone) - 37.6 ng/ml, and β-hCG - 22.9 mIU/ml. Then, on a separate document, she showed β-hCG - 52.71 mIU/ml, progesterone - 19.70 ng/ml, and estradiol - 214 pg/ml. She claimed the doctor said it was too early to perform an ultrasound. However, the following day, she presented what appeared to be an ultrasound showing a visible sac, along with a supposedly positive urine pregnancy test.

I am questioning the physical plausibility of all this. I am also suspicious because the documents she provided lack any verifiable information, like a name, hospital name, or doctor’s signature.

Please advise.

Answer 1

Hello,

Welcome to icliniq.com.

I understand your concerns and appreciate you sharing the details.

Firstly, as per the history you shared, you had unprotected sex approximately two and a half weeks ago. However, you gave her the Plan B tablet (emergency contraceptive pill) within four hours, which was a very responsible and effective step. The emergency contraceptive pill works by thickening the cervical mucus, making it difficult for sperm to enter the uterus. It also delays ovulation and alters the endometrium, preventing implantation by causing endometrial atrophy.

You also mentioned that she had her period last week. If that bleeding was similar to her usual period, bright or dark red in color, soaked one to two pads per day, lasted three to seven days, and was associated with mild to moderate abdominal cramps, it is very likely that this was normal menstrual bleeding.

Additionally, you said that following the bleeding, you both conducted a serum β-hCG (beta-human chorionic gonadotropin) test, which showed a level of 0.50 mIU/mL (or below 5), and also did a urine pregnancy test, which was negative. These results clearly indicate that pregnancy did not occur. If there had been a pregnancy, the β-hCG levels would have continued to rise, not stayed low or negative.

It is also important that any laboratory test report should include the patient’s name, age, reference number, the name of the referring doctor, and the date of sample collection. If these details are missing, the report may not be official or reliable. I want to reassure you that based on the history and the test results, there is no indication of pregnancy. However, if you still have doubts or she feels anxious, I would recommend visiting a hospital and repeating the β-hCG test together. This should help resolve any remaining concerns immediately.

I hope I have been able to clarify everything for you.

If you have any further questions, please do not hesitate to contact me.

Kind regards.