Concerned

Okay, so I had sex for the first time last night. We used no protection but due to it being the first time it wasn't consistent nor fun so we stopped shortly after. I'm the biggest worry wart in the world and I'm trying to calm my nerves. I know we should've wore a condom and will for now on but is there any way I could be pregnant from pre-cum? According to glow I'm suppose to start my period in 3 days ( 4 days from having sex)