Chances of pregnancy?

Cait • 25. Married. Mama.
Ladies, I'm extremely confused. I last had sex March 26-28 and had a light period March 30-April 1. I got a positive opk test April 14th and my period isn't due until April 29th. 
This morning I went to the bathroom to some very bright pink spotting. And extremely sick to my stomach all week. The smell of food makes me gag. 
Could it be one of my cyst bursting or early period? Pregnant? 

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