Originally Posted by
Alty
It wasn't four days late, it was 1 day late. You said you were supposed to get it 11/15, but didn't get it until 11/16. That's not 4 days, that's 1.
Implantation bleeding hasn't been proven. Some people believe it exists, others don't. I don't.
Either way, it would be too early to test.
At this point in time, from what you wrote, you were one day late and had a period. To me that would indicate that you're not pregnant. But if you really feel you are, wait two weeks and then test using first morning urine.