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How to differentiate between implantation and menstrual bleeding?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

How can I differentiate the difference between implantation bleeding and my period? My period used to last five days, but this time, it only lasted three days. Yesterday, I started bleeding, but it is brown and not very heavy, though there is a lot of it. I have been taking Desogestrel pills, but I missed the last three pills. Also, my period only lasted a few hours. What could this be?

Implantation bleeding is usually lighter, shorter, and can be brown or pink. Missing birth control pills can mess with your cycle and cause lighter or irregular bleeding. If you are worried about pregnancy, taking a test might help, but missing pills can also affect your period.

Kindly help.

Hello,

Welcome to icliniq.com.

I understand your concern.

There are a few possible reasons for your bleeding. One is implantation bleeding, which can happen if you are pregnant. It is usually light spotting that is pink or brown and lasts a few hours to two days. It does not involve heavy flow or clots and occurs six to 12 days after unprotected sex, without typical period symptoms like cramps or bloating. Another possibility is withdrawal bleeding from missed Desogestrel pills. Missing or stopping birth control pills can disrupt your hormones, causing irregular bleeding, which may be brown (old blood) and shorter than usual, especially if you missed three or more pills. Breakthrough bleeding, which is also linked to hormonal changes, can happen if you miss pills or do not take them at the same time each day. Since you missed the last three Desogestrel pills, it is most likely withdrawal bleeding due to a drop in hormones. However, if you had unprotected sex before missing the pills, pregnancy could also be a possibility. To figure out what is going on, consider taking a pregnancy test at least 10 to 14 days after unprotected sex for an accurate result. If you want to continue birth control, restart your pill pack as instructed or use protection. Keep an eye on any unusual symptoms in your next period or if you experience pregnancy signs like nausea, fatigue, or sore breasts, and see a doctor if needed. Let me know if you want help in calculating your pregnancy risk based on your cycle and pill use, and if you would like to check for any hormonal imbalances, your height and weight could help with that, too.

I hope you are satisfied with my answer. For further queries, you can consult me at iCliniq.

Thank you.

Medically reviewed byiCliniq medical review team
Published At April 13, 2025
Reviewed AtJuly 2, 2026

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