I let him finish inside me

Last night I had sex with my boyfriend, and he usually pulls out but he finished inside of me. I’m on birth control, and I take the pill every single day at 3 after school. I start my fertile window tomorrow, but I’m still unsure on something’s. My friend told me I could get plan b, but I don’t think it’s a big deal. I just worry. Do you guys think I’m okay??