Normal periods signs not there

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So I always look in the toilet even if I just pee. Normally 2-3 days before my period I start to see some lining in the toilet. My period is due Monday and I haven't seen any of that. I had a random discharge a few days ago that was on my undies but didn't have it again. I have taken a early detection and it's negative. We had sex the night before I ovulated (which was an early ovulation for me!) which was august 2nd. Shouldn't a test be positive by now? If I am not prego we are getting tubes tide and hubby snipped. I have had too many miscarriages.