Can I be pregnant with unprotected sex, but he did pull out?

Hello doctor,

I am currently concerned about whether I am in the early days of pregnancy, but I am unsure and confused. I did three tests yesterday; two were clear negatives, and one had a faint positive line. I have been feeling some signs of early pregnancy over the last week, such as random nausea, smells making me feel sick, significant fatigue, and over a week ago, I missed my period.

We had unprotected sex four times, but he did pull out. However, I am unsure how effective his pulling out was over the four times that night and day.