What is the reason for dizziness, fatigue, and nausea after taking birth control pills?

Patient's question:

I had unprotected sex with my girlfriend last month on the 6th. The next day, we took a post-coital contraceptive pill. Then on the 16th, she had her period (her cycle is usually very regular). After that, we used condoms for every sexual encounter. However, around the 18th or 19th of this month, she suddenly experienced symptoms like dizziness, fatigue, and nausea (she said her stomach always feels like acid is coming up). Could she be pregnant? Thank you!
First follow-up question: I know this too, but thanks for your answers!
Second follow-up question: Thanks for everyone's concern! We took a pregnancy test and it was negative. Since yesterday, she hasn’t had any symptoms.

Doctor's answer:

??????This situation still falls under the category of discomfort caused by medication side effects. Drink more water and get more rest.
Consider drinking more water to aid metabolism, observe a normal menstrual cycle, and actively use early pregnancy tests if there is a delay. Pay attention to local hygiene and enhance nutrition. In fact, under normal circumstances, practicing any form of contraception can have certain adverse effects on women. Therefore, patients should pay attention to their diet. Contraceptive users should take care of themselves, such as adjusting their diet, staying warm, and avoiding colds.

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