I took two pregnancy tests one came up positive and the other one i took this morning went straight to positive then to negative what should i do

Please : Please see your doctor and have a blood pregnancy test which is more accurate (basically 100% accurate). This will put your mind to rest.

Agree with Dr. E.: If you had sex since your last period and missed your period by 4-5 days, do a home pregnancy test. If the result is negative repeat the test 4-5 days later unless you get a period by then. Use first morning urine and follow the instructions for the test carefully. Alternatively you could get a blood test for HCG one day after a missed period.