Symptoms..?

How soon can you tell if you’re pregnant? And what symptoms should I look for?? My boyfriend and I had sex for the second time last Sunday and I am stressing out. (Even though I really shouldn’t since he used a condom, it didn’t break, and he took it off away from me.) I’m supposed to start in about 8 days but I am so stressed about being pregnant that I’m afraid that will make it late. And if it’s late, I will die because I’m going to take it as “Your period isn’t here yet. You’re pregnant”. But I have been experiencing some PMS symptoms like acne (🙄🙄🙄) and cramps. Or could those mean I’m pregnant?? Like I said, could it be too soon to even have symptoms of pregnancy??