Could I be testing too early?

So I'm 18 and my cycle ranges between 26-32 days. I had unprotected sex on the 21st April and he may have came in me. Today is day 32 of my cycle and I haven't got my period(it's never gone over 32 days) so I took a pregnancy test and it's come back negative. My question is, could I be testing to early and how long should I wait to test again? 
I've also got my typical pre-period sore boobs and pimple outbreak if that helps. 😊

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