What causes pregnancy test to be positive and then negative a week after

what causes pregnancy test to be positive and then negative a week after

There are few possibilities,

1: the kit is damaged,

2: you may have missed abortion,

3: you may have ectopic pregnancy which resolved on its own,

4: sometimes molar pregnancy with excessive high serum beta HCG.

Suggested:

1: serum b HCG

2: ultrasonography of pelvis

Same happened with me… 1st day 2 lines on strip in excitement i did 2nd time test again it was 2 lines . But when i went for blood test it comes negative. Then in strip test also single line