Is there still a chance I could be pregnant ?

Here's a chart the hearts are the days we had sex the red is period and the yellow is ovulation days which I confirmed with opks
I've had several negative tests
My period is due today and still not here
Having tugging cramp like pains in my lower abdomen 
My nipples are so sore they are never sore. And also the veins are very prominent which I also never get
Help a girl out 😤😪

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