Nipples hurt,upper stomach is hard, been nauseaed, peeing alot been off of birth control for 3week taking 3 home pregnancy test all came back negative?

Trust the test: Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection. See doctor for your pain