Every pregnancy symptom in the book

Basically, 3 days after having sex (which was exactly 2 weeks ago today using the withdrawal method) I got really bloated and had indigestion. A week later I had really bad stomach cramps so I took painkillers. I then got a fever and my whole body ached, like even my head. This week, I've been feeling nauseous, tired and I've got creamy white discharge. I also usually have acne but my skin is completely clear. I really don't want to be pregnant, my period is due in a week and I've been constantly worrying. How early can you take a test?