Not to criticize, but Lacy is wrong. They are not all the same. They all have different sensitivities to the hormone your body produces while you're pregnant. Generally the more expensive ones are more sensitive. It's one of the few things in life where you do get what you pay for. You can go to planned parenthood or or any organization along those lines and get a free pregnancy test done if you can't afford to keep testing. But, your best bet is to go to your doctor and ask for a blood test. Over the counter tests don't touch the sensitivity levels of a blood test. Good luck.
I have been told that I am wrong, but I am positive I am not. And just want to make things clear. Here is a quote from a reputable website, google "are all pregnancy tests equal" or something to that nature and you'll find out the same thing.
"Not all pregnancy tests are created equal. The more sensitive the test (the smaller amount of hCG it can detect), the earlier the opportunity to detect pregnancy. That means with a test sensitive to 20 mIU/ml hCG, a home pregnancy test is accurate as early as six to eight days after conception, well before your first missed period. NOTE: Conception may take place several days after date of intercourse, so the date of intercourse should not necessarily be viewed as the day of conception.
Brand Detects
Early-Pregnancy-Test 20 mIU
AimStick Dipstick 20 mIU
AimStep Cassette 20 mIU
AimStick Midstream (AccuHome) 25 mIU
Clearblue Easy (UK) 25 mIU
Day Seven (CDN) 25 mIU
Health Check 25 mIU
One Step Be Sure 25 mIU
Rapid Self-Test 25 mIU
E.P.T 40 mIU
Clearblue Easy (US) 50 mIU
Boots 50 mIU
Early Bird One Step 50 mIU
Early Pregnancy test 50 mIU
Hannaford 50 mIU
Rite-Aid 50 mIU
Selfcare 50 mIU
CVS 60 mIU
First Response 100 mIU
Answer 100 mIU
Conceive 100 mIU
Precise 100 mIU
Fact Plus 150-250mIU"
Also, a pregnancy test will turn positive after leaving it for a few hours even if you're not pregnant. The reading is only accurate at the time the instructions tell you to read the result. If you wait hours after, it is a false positive.
I am not trying to be "rude" as I am told I am being by stating that other people are incorrect. I am simply making sure that the truth is known.