Blood test tomorrow

My period is 5 days late, that never happens, I can count on one hand every time my period has been late and it was always from either the pill or morning after pill.

Been off BC for a couple months now and TTC this is the first time I've been late since we started trying..the problem is I have got 5 negative tests in a row!! So I called my doctor and booked a blood test for tomorrow, Anyone else gone this long without a positive test and still ended up being pregnant?

I'm so confused!