How long does ecstacy stay in your system?

I took half a pill it was blue superman and I took it Sunday at 4:30pm and I have a test on monday(not the monday after the sunday I took ti the monday on the following week) will I be clean by then? I'm 5'8 about 125 I have low body fat high metbolism and I skate and drink alot of water will that help at all? also I took half a oxycottin on monday would it be in my system on the following monday?