I am 2 weeks late with my period. all the pregnancy tests shows negative. can i be pregnant? i drink oralcon everyday. my breasts hurt and it's tender. how long should i wait before i test again and should i do a blood test?

Tests are accurate: Today's home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (or when conception might have happened) or 1 week after missing a period. If done sooner, a negative result may be due to testing too early, such as less than 2 weeks after conception.