missed my period for over two weeks

So my I missed my period for this month which was supposed to show on the 8th, I'm 26yrs and I never missed a period, though I had blood stain after sex every day from 2 to 4 of the month, my husband think that stain was the period because all my tests came back negetive. Please is that position I still think I'm pregnant though but he keep saying it's in my head, I'm so confuse, I've being trying for two year now. Should I request for a blood work to confirm? Pls help