Pulling out

Hi ladies! I just need an honest opinion from any of you. I’ve been having unprotected sex for about a couple months, with saying that he pulls out. But at the same time we have not use the restroom after and I heard if he doesn’t pee right after finishing and then we start again that there is leftover sperm. And we have also been having sex in my fertile window. Is there a high percentage I could be pregnant? I’ve taken 2 tests, both negative but it’s only been 5-6 days. Thanks for any advice!