Could I really be 17 and pregnant?

On March 27th my boyfriend and I had unprotected sex, he didn’t cum in me, he pulled out just in time and came on my chest. After that, a week later I took a pregnancy test, and it came out negative. I’m not sure if I took the test too early. I was supposed to start my period April 18th, but I didn’t get it yet. I’ve been peeing frequently and my discharge is watery than usual. Could I be pregnant?

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