Unprotected late night sex

So last night i met up with the guy I’ve been seeing and GAWD DAMN. We had sex for the first time and it was great. The only problem was that he didn’t have any condoms but i was okay with it. The only concern that i have is that i know that there was precum involved for sure. Also, he didn’t finish inside me. He pulled out before he did and i gave him a bj so he can finish. But girls what do you think? Should i be worried about being pregnant? I know it was just precum but i just want to be safe about it to see if its a big deal. Also, i should be starting my period on Saturday according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>, if that means anything.