I had unprotected intercourse on the 2nd of March (the 9th day of my cycle) and took an Instafree 72 tablet a few hours later. On the 11th and 12th, I experienced some bleeding. My period was due to come on the 25th of March, but it's been a week and still not arrived yet. I've taken pregnancy tests and all of them are negative. What should I do?

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