It's very unlikely that I'm pregnant - isn't it?

[Sasha90]

Please help. I'm 4 days late.
Negative tests.
I had sex once on CD4.
I think I ovulated around day 18/19.

I've been feeling like my period is coming for the last few days but there's nothing.

A test would show positive by now wouldn't it?

Tests are pretty accurate when you take them after your period was supposed to be due. So unlikely, but if it’s still a no show test again just in case.

Thank you!

Sperm can live 'inside' up to 5 days, 7 at the absolute max. So having sex 15 days before ovulation cannot lead to pregnancy. How did you confirm ov? Are you certain you ovulated then? Was it over two weeks ago?