**Is this normal? Please help! Advice needed ASAP**

So me and my S.O had some “special time” a week ago but it was only for about 5 mins and neither of us were close (rudely interrupted 😂) and we didn’t have a condom at the time. I finished my last period literally the day before baring in mind too.... Since that week has passed I’ve noticed that I’ve had a lot of white discharge and I’m beginning I worry, I’m only 18 and terrified if I’m pregnant..... please can reassure me that I’m going to be alright if it’s true??