pregnancy scare

So I've been having sore boobs cramping and nausea and eat a lot and I'm wondering if I'm pregnant or not how long should I wait till I take a test I have 8 days till my period but I've been feeling this way ever sence it said I had 20 something days till my period what should I do and Friday I'll have waited two weeks after sex so should I take the test this weekend or after 9 days when my period is supposed to come