Can anyone help?

So my boyfriend & I had unprotected sex around 1 AM Wednesday morning. & he didn't cum in me because he pulled out but i dont know about precum & all that. It's a slim chance that precum can get you pregnant but I'm just a little worried. I dont know if I'd absolutely need to take plan b. It's super expensive but If need be ill get my boyfriend to get it but if i won't need it then I'd rather not spend $50+ on two pills. If someone went through the same or if someone can just help me that'd be amazing! & please no rude comments.