Implantation bleeding or period?

I had sex August 21st (He did ejaculate inside me),and i woke up and i peed,and i saw blood. I checked my panties,and i saw NO blood! I wiped,and it was a little bit of dark blood. Im having light cramps. ALSO i think i could be 14 weeks pregnant starting today, but i took tests and it came out negative. I had sex... show more I had sex August 21st (He did ejaculate inside me),and i woke up and i peed,and i saw blood. I checked my panties,and i saw NO blood! I wiped,and it was a little bit of dark blood. Im having light cramps. ALSO i think i could be 14 weeks pregnant starting today, but i took tests and it came out negative. I had sex 2 days ago also.
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