False positive?

So I've recently started taking BC, the 14th to be exact, and I am now 6 days late for my period. 
( I was put on BC for cysts. )
And as of two days ago, I've received 5 positive pregnancy tests
But I had taken one maybe 4-5 days ago and it was negative. 
Could I be receiving false positives because the BC is changing my body or..?? 
( I have also stopped taking the BC until I find out for certain . )
 
( I've also been cramping for like 2 maybe 3 weeks now. The feeling like you're about to get your period.....but never do . Dun dun dunnn. )

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