We have had sex on 5th day of her period when bleeding almost stopped...I was careful not to ejaculate... But it's been 20 days now that my girlfriend is feeling symptoms of pregnancy like nausea, vomiting sensation, stomach pain, feeling to not consume...As there are rare chances of getting pregnant through precum I am asking this question...Is there methods to know about pregnancy before missing periods?...she also has irregular period, her last was 45 days after the previous period...and what should be done to not get pregnant? If the results are positive