protected or take a plan b?

Hi, curious if I’m protected or should take a plan b.

I’ve been on the pill for years and usually take it at the same time every day. On Sunday I was supposed to start a new pack but was 10 hours late and took it on Monday morning. Tuesday night I took it one hour late (at 10pm) but Wednesday and Thursday I took them on time. However late Thursday night I had sex and he pulled out “too late.”

He did nut on me but says he got some in me. This was 4 pills after the late one. Do you think I’m protected? What are the chances I get pregnant? Should I take a plan b? Thank you