8 days late and negative PG tests.

So here I am 8 days late now, and I'm so scared to take another test. I took one 2 days ago and it was negative. At 6-7 DPO I had "implantation bleeding"(it was really light brown and only last like 3 days). I usually get sore boob a we

ek before my af is due. Should I retest on a couple more days or should I go ahead and make a doctor's appointment??