Pregnancy spotting?

I was spotting from the 6th-8th then again on the 12-13th. Period was due on the 14th I tested on the 15th and the test came out negative but in person I thought I saw a faint line that my camera couldn’t pick up. So I tested again days later and it was negative again. Today I am spotting again... any of you ladies experienced spotting when you were pregnant? I am on the pill and that’s the only form I use

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