Decidual Bleeding During Pregnancy Question About Equate Tests/my Possible Pregnancy?

Question about Equate tests/my possible pregnancy? - decidual bleeding during pregnancy

Hello,
I love what I think was ovulation. I also had light bleeding for 3 days and started in place at that time. (I did my homework, ha ha).
Anyways ... My question is:
I did a test (EQUATE Walmart) and looked after 18 minutes instead of 10 because I forgot =/...... Thus, the horizontal portion of the light was a plus sign, and the signal vertical signal is easier! Only the top and bottom of the vertical line is visible to me.
However, time approx 6 hours per day (), and all disappeared.
I wonder if anyone else has experienced anything similar with this problem? What characters are mild and disappear after a while?
ALSO ....... Brown, recently I received the light, sPots, and I have to use a pantyliner. I wondered whether it decidual bleeding? and if so, it would be less my HCG hormone? that affect the pregnancy test?

THANK YOU!