Used plan b twice within a month and a week. my first pregnancy test was positive 7days after sex. over the next month i've gotten all negative at home pregnancy tests. a week after the positive i bled for three days btw. verdict?

A positive HCG on a pregnancy test "7 days after sex" may have indicated that the pregnancy pre-dated the sexual activity. Bleeding after a positive HCG test followed by negative home (HCG) tests may reflect an early miscarriage. Plan B should not be relied upon to provide reliable protection from pregnancy.

Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.