Thoughts on false positives. Please read before commenting to get full background.

Bu
So I'm cycle day 13 on a 30 day cycle. I'm 30 days every month like clock work. Usually I get positive opk's around day 14-15. So I'm in testing mode. Well last night I took a pregnancy test, just because and got a positive. My last cycle started on time lasted 5 days like normal. So are false positives possible?? Line came up within time frame as well 

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