I tested the week I had the implantation bleeding even though I was certain I was pregnant. It was negative. I did it again a week later and it was positive, but very faint. Still in denial( don't know why) I tested again 2 weeks later, it was very dark. It really depends on your HCG levels and the test sensitivity. I got a regular test each time, but I know there are some tests taht are very sensative. They are the ones you can use to test 4 days before your missed period. Might be worth a try, but since I was certain I couldn't justify the extra expense.
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