What is the reason for frequent urination and urgency after taking emergency contraception?

Patient's question:

Patient Gender: Female
Detailed Medical Condition and Purpose of Consultation:
My boyfriend and I had contraceptive failure last week and took emergency contraception (Cyclo-Progynol). The next day, I wasn’t reassured and took another two-packet dose of Huiting. Since then, I’ve been experiencing frequent urination, with very little or no urine after going to the bathroom. When I really need to urinate, it feels very urgent, as if I’m holding back urine, and this sensation is even stronger with movement, making it very distracting. Today, I have some right-sided lower back pain, and once I urinated, it was tinged with red, with some blood clots. Did I get pregnant? Or is it due to stress? Or is it related to the medication? Will the medication still prevent...

Doctor's answer:

There is no necessary connection between taking emergency contraception pills and frequent urination or urgency to urinate. Your symptoms may be a sign of a urinary tract infection. It is recommended that you visit a hospital for some tests and receive targeted treatment.
What I need to tell you is that a common side effect of taking emergency contraception pills is irregular menstruation and vaginal bleeding. In your case, you may experience bleeding about a week after taking the medication. This is due to the drug-induced withdrawal bleeding, which is not a normal menstrual period. The bleeding is usually light and stops within a few days. The next menstrual period may come a few days earlier or later, but it generally does not exceed half a month.
Since emergency contraception pills have significant side effects, it is best to use other forms of contraception. Otherwise, they can easily lead to hormonal imbalance in the body, causing menstrual disorders and even infertility.