Please help! BFP then BFN

Took the first test last night and the line came up within seconds. Only 9-10 dpo I wasn’t expecting that! My breasts were so sore I decided to test. Took another test 2 hours later and BFN! Then waited for FMU and another negative!! Could the test be faulty! I will skip a day and test again to give hcg time to build up if that may be the case. Just truly confused! I felt I had a pretty dark line for 9-10 dpo- I guess too good to be true! I’m just shocked it went stark white! Up to the light there may be a super faint line on both tests I took afterward but barely visible at all. I question if the first text could be faulty as the test line is thinner and slightly fades toward the bottom but it is a solid line with color.

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