Pregnancy Chances: What to Know About Your Cycle - Obstetrics and Gynecology

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Probability of Pregnancy


Hello doctor, my last menstrual period was on May 24.
I usually have a cycle of about 35 days.
As of today, July 3, my period has not arrived, and I have no signs of pregnancy.
I have taken pregnancy tests on June 28 and July 2, both showing a single line.
I had intercourse on June 10, 16, and 22 without protection, but there was no ejaculation.
Is it possible that I could be pregnant?

Nü, 20~29 year old female. Ask Date: 2020/07/03

Dr. Huang Yiwen reply Obstetrics and Gynecology


Hello, Miss: Under normal circumstances, your menstruation should arrive around the end of June.
You took a urine test on July 3rd and it showed no pregnancy, so you are likely not pregnant.
Additionally, since there was no ejaculation during intercourse, the chances of conception are even lower.
I suggest you not to worry too much; wait another week and if your period still hasn't arrived, take another urine test.
If the result is still negative, you can consider trying medication to induce your period.

Reply Date: 2020/07/03

More Info


Understanding your chances of pregnancy can be quite complex, especially when considering factors like menstrual cycle length, timing of intercourse, and the reliability of pregnancy tests. Based on the information you provided, let's break down your situation.

You mentioned that your last menstrual period (LMP) started on May 24, and you typically have a cycle length of about 35 days. This means that your next expected period would be around July 4, assuming a regular cycle. Since today is July 3 and you have not yet received your period, you are technically one day late. However, it is important to note that menstrual cycles can vary, and a late period does not automatically indicate pregnancy.

You also mentioned having unprotected intercourse on June 10, 16, and 22. Sperm can survive in the female reproductive tract for up to five days, so if you ovulated shortly after these dates, there is a possibility of pregnancy. Typically, ovulation occurs about 14 days before your next expected period, which for a 35-day cycle would be around June 19. Therefore, intercourse on June 16 and 22 could potentially coincide with your fertile window, increasing the chances of conception.

Regarding the pregnancy tests you took on June 28 and July 2, it is important to ensure that you are using a reliable test and following the instructions carefully. Home pregnancy tests are generally accurate when used correctly, especially after a missed period. However, if you tested too early, it is possible that the hormone hCG (human chorionic gonadotropin), which is produced during pregnancy, was not at a detectable level yet.
Given that you have had two negative tests, it is less likely that you are pregnant, but it is not impossible. Stress, hormonal imbalances, or other factors can also cause a delayed period. If your period does not arrive in the next few days, it may be worth taking another pregnancy test or consulting with a healthcare provider for further evaluation.

In summary, while there is a possibility of pregnancy based on your cycle and timing of intercourse, the negative pregnancy tests suggest that it may be less likely. If your period does not come soon, consider reaching out to a healthcare professional for advice and possibly further testing. They can provide guidance tailored to your specific situation and help address any concerns you may have.
In the meantime, keep track of any other symptoms you may experience, such as breast tenderness, nausea, or fatigue, as these can also provide clues about your reproductive health. Remember that every individual is different, and factors such as stress, lifestyle, and health conditions can all play a role in your menstrual cycle and overall reproductive health.

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