Dear joana if you are still having periods, rather it is light flow, after unsafe sex, then there are virtually no chances of being pregnant. But just to be on the safe side, it would be wise to take a home pregnancy test. Please use condom next time. But consult a registered doctor for urinal problem and headache. https://lovematters.in/hi/resource/safe-sex https://lovematters.in/hi/pregnancy/home-pregnancy-tests-dos-and-donts If you would like to join in on a further discussion on this topic, join our discussion board, ‘Just Ask’ https://lovematters.in/en/forum