I took a pregnancy test at home and it came back positive but doctor says there is no sac or anything?

I took a pregnancy test at home and it came back positive. I went to the doctor to get a termination, however the doctor stated he couldn’t find a sac or anything.my test results was pos/neg.. I may be experiencing a chemical pregnancy. My question is since there no sign of a fetus can I take a plan B to make my period come down?

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